feat(integrations): pydantic, fastapi, django integration modules as opt-in extras (#284)

Ships the framework-integrations bundle end to end so an
:class:`edify.Pattern` can drop straight into the field-validation
layers of the three Python frameworks most teams actually use.

## Integration modules

- **`edify.integrations.pydantic`** — `pattern_validator(pattern)`
returns a Pydantic-compatible validator callable;
`pattern_field(pattern)` returns an `Annotated[str,
AfterValidator(...)]` type you drop into a `BaseModel` field.
- **`edify.integrations.fastapi`** — `pattern_query(pattern, ...)` and
`pattern_path(pattern, ...)` return `fastapi.Query` / `fastapi.Path`
values pinned to the pattern's emitted regex string, with `default=` and
every other FastAPI kwarg forwarded through.
- **`edify.integrations.django`** — `pattern_validator(pattern,
message=..., code=...)` returns a
`django.core.validators.RegexValidator` pinned to the pattern's regex
source, with the message default derived from the pattern.

Every integration follows the same deferred-import pattern that
`edify[regex]` uses: `import edify.integrations.pydantic` (etc.)
succeeds without the framework installed; the first helper call resolves
the framework lazily and raises `MissingIntegrationDependencyError`
(annotated summary + pointer block + `= note:` + `help:` line) telling
the caller to `pip install edify[<framework>]`.

## Extras + optional-dependencies

- `[project.optional-dependencies]` gains `pydantic =
["pydantic>=2.0"]`, `fastapi = ["fastapi>=0.100"]`, `django =
["django>=4.2"]`, and `all = [everything]`.
- The `dev` group installs all three frameworks so local + CI runs cover
the integrations without gating on the extras.

## CI install-per-extra verification

- New matrix job `install-with-integration-extra` runs one entry per
extra (`pydantic`, `fastapi`, `django`, `all`).
- Each entry installs into a fresh venv, imports the integration module,
and drives a small probe script that verifies the helper accepts a
matching value and rejects a non-matching value.
- Same shape as the existing `install: edify[regex]` verification — any
drift in the `[project.optional-dependencies]` declarations fails
loudly.

## Sphinx autodoc

- New `docs/integrations/index.rst` page with `.. automodule::` blocks
for each of the three integration modules.
- Wired into `docs/index.rst` toctree.
- `.readthedocs.yml` installs `.[all]` so autodoc always has every
framework annotation available to resolve.

Closes #220, closes #221, closes #222, closes #223, closes #224, closes
#225, closes #226, closes #227.

64 files changed, 1140 insertions, 217 deletions

diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index c0ed6e2..f9f49d6 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -131,6 +131,81 @@ jobs:
           assert via_regex.search("foofoobar") is not None
           PYCHECK
 
+  install-with-integration-extra:
+    name: ${{ matrix.name }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: 'install: edify[pydantic]'
+            extra: 'pydantic'
+            probe: |
+              import edify
+              from edify.integrations.pydantic import pattern_validator
+              from edify.library import email
+              validate = pattern_validator(email)
+              assert validate("[email protected]") == "[email protected]"
+              try:
+                  validate("bad")
+              except ValueError:
+                  pass
+              else:
+                  raise SystemExit("expected ValueError on non-matching input")
+          - name: 'install: edify[fastapi]'
+            extra: 'fastapi'
+            probe: |
+              import edify
+              from edify.integrations.fastapi import pattern_query, pattern_path
+              from edify.library import uuid
+              from fastapi.params import Query, Path
+              assert isinstance(pattern_query(uuid), Query)
+              assert isinstance(pattern_path(uuid), Path)
+          - name: 'install: edify[django]'
+            extra: 'django'
+            probe: |
+              import edify
+              from edify.integrations.django import pattern_validator
+              from edify.library import uuid
+              from django.core.exceptions import ValidationError
+              from django.core.validators import RegexValidator
+              validator = pattern_validator(uuid)
+              assert isinstance(validator, RegexValidator)
+              validator("01234567-89ab-1cde-8f01-23456789abcd")
+              try:
+                  validator("not-a-uuid")
+              except ValidationError:
+                  pass
+              else:
+                  raise SystemExit("expected ValidationError on non-matching input")
+          - name: 'install: edify[all]'
+            extra: 'all'
+            probe: |
+              import edify
+              import pydantic
+              import fastapi
+              import django
+              from edify.integrations import pydantic as edify_pydantic
+              from edify.integrations import fastapi as edify_fastapi
+              from edify.integrations import django as edify_django
+              from edify.library import email
+              assert edify_pydantic.pattern_validator(email)("[email protected]") == "[email protected]"
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39
+        with:
+          python-version: '3.11'
+      - name: install edify[${{ matrix.extra }}]
+        run: |
+          uv venv .venv-${{ matrix.extra }}
+          uv pip install --python .venv-${{ matrix.extra }}/bin/python '.[${{ matrix.extra }}]'
+      - name: probe integration surface
+        env:
+          PROBE_SCRIPT: ${{ matrix.probe }}
+        run: |
+          .venv-${{ matrix.extra }}/bin/python -c "$PROBE_SCRIPT"
+
   bench:
     name: 'bench (advisory)'
     runs-on: ubuntu-latest
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 3dea7f0..2829272 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -11,3 +11,5 @@ python:
     - requirements: docs/requirements.txt
     - method: pip
       path: .
+      extra_requirements:
+        - all
diff --git a/docs/index.rst b/docs/index.rst
index e209f14..8799638 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -8,6 +8,7 @@ Contents
    readme
    built-in/index
    regex-builder/index
+   integrations/index
    contributing
    authors
    changelog
diff --git a/docs/integrations/index.rst b/docs/integrations/index.rst
new file mode 100644
index 0000000..9267d07
--- /dev/null
+++ b/docs/integrations/index.rst
@@ -0,0 +1,41 @@
+Integrations
+============
+
+Edify ships lightweight integration modules that let you drop a compiled
+:class:`edify.Pattern` into the field-validation layers of the frameworks
+most Python teams actually use. Each integration is an opt-in extra —
+``pip install edify`` never pulls the framework in, and importing an
+integration module never imports the framework at module load time. The
+first helper call resolves the framework lazily; when the extra is
+missing you get a clean :class:`edify.errors.integration.MissingIntegrationDependencyError`
+with the exact install line to run.
+
+Install any one, or all three:
+
+.. code-block:: shell
+
+    pip install 'edify[pydantic]'
+    pip install 'edify[fastapi]'
+    pip install 'edify[django]'
+    pip install 'edify[all]'
+
+
+Pydantic
+--------
+
+.. automodule:: edify.integrations.pydantic
+    :members:
+
+
+FastAPI
+-------
+
+.. automodule:: edify.integrations.fastapi
+    :members:
+
+
+Django
+------
+
+.. automodule:: edify.integrations.django
+    :members:
diff --git a/edify/__init__.py b/edify/__init__.py
index 48387a6..11f94b2 100644
--- a/edify/__init__.py
+++ b/edify/__init__.py
@@ -1,6 +1,6 @@
 import importlib.metadata
 
-from edify.builder.builder import RegexBuilder
+from edify.builder.fluent import RegexBuilder
 from edify.errors.base import EdifyError
 from edify.errors.syntax import EdifySyntaxError
 from edify.pattern.anchors import END, START
diff --git a/edify/builder/__init__.py b/edify/builder/__init__.py
index ed3e1ce..58c8321 100644
--- a/edify/builder/__init__.py
+++ b/edify/builder/__init__.py
@@ -1,3 +1,3 @@
-from edify.builder.builder import RegexBuilder
+from edify.builder.fluent import RegexBuilder
 
 __all__ = ["RegexBuilder"]
diff --git a/edify/builder/builder.py b/edify/builder/fluent.py
index cde72d9..cde72d9 100644
--- a/edify/builder/builder.py
+++ b/edify/builder/fluent.py
diff --git a/edify/builder/mixins/captures.py b/edify/builder/mixins/captures.py
index 4ba2fec..5841b95 100644
--- a/edify/builder/mixins/captures.py
+++ b/edify/builder/mixins/captures.py
@@ -62,7 +62,7 @@ class CapturesMixin(BuilderProtocol):
         return self._with_state(new_state)
 
 
-def _validate_new_named_group(name: object, existing_names: tuple[str, ...]) -> None:
+def _validate_new_named_group(name: str, existing_names: tuple[str, ...]) -> None:
     """Raise the appropriate naming error if ``name`` cannot be declared as a new named group."""
     if not isinstance(name, str):
         actual_type_name = type(name).__name__
diff --git a/edify/builder/mixins/chars.py b/edify/builder/mixins/chars.py
index a491b3b..570493d 100644
--- a/edify/builder/mixins/chars.py
+++ b/edify/builder/mixins/chars.py
@@ -93,7 +93,7 @@ class CharsMixin(BuilderProtocol):
         return self._with_state(new_state)
 
 
-def _ensure_is_string(label: str, value: object) -> None:
+def _ensure_is_string(label: str, value: str) -> None:
     """Raise :class:`MustBeAStringError` when ``value`` is not a string."""
     if isinstance(value, str):
         return
@@ -108,7 +108,7 @@ def _ensure_non_empty(label: str, value: str) -> None:
     raise MustBeOneCharacterError(label)
 
 
-def _ensure_single_character(label: str, value: object) -> None:
+def _ensure_single_character(label: str, value: str) -> None:
     """Raise :class:`MustBeSingleCharacterError` when ``value`` is not a length-1 string."""
     if isinstance(value, str) and len(value) == 1:
         return
diff --git a/edify/builder/mixins/groups.py b/edify/builder/mixins/groups.py
index 7151f1f..ff14140 100644
--- a/edify/builder/mixins/groups.py
+++ b/edify/builder/mixins/groups.py
@@ -67,7 +67,8 @@ def _open_frame(builder: _TBuilder, type_node: BaseElement) -> _TBuilder:
 
 def _add_literal_alternation(builder: _TBuilder, literals: tuple[str, ...]) -> _TBuilder:
     """Append a single :class:`AnyOfElement` built from ``literals`` to the top frame."""
-    children = tuple(_literal_to_element(literal) for literal in literals)
+    child_elements = [_literal_to_element(literal) for literal in literals]
+    children = tuple(child_elements)
     element = AnyOfElement(children=children)
     new_state = builder._state.with_element_added_to_top(element)
     return builder._with_state(new_state)
@@ -83,7 +84,7 @@ def _literal_to_element(literal: str) -> CharElement | StringElement:
     return StringElement(value=escaped)
 
 
-def _ensure_is_string(label: str, value: object) -> None:
+def _ensure_is_string(label: str, value: str) -> None:
     """Raise :class:`MustBeAStringError` when ``value`` is not a string."""
     if isinstance(value, str):
         return
diff --git a/edify/builder/mixins/subexpression.py b/edify/builder/mixins/subexpression.py
index 0ba96f5..bfa006e 100644
--- a/edify/builder/mixins/subexpression.py
+++ b/edify/builder/mixins/subexpression.py
@@ -80,7 +80,7 @@ class SubexpressionMixin(BuilderProtocol):
         return self._with_state(state_with_flags)
 
 
-def _ensure_is_builder(expression: object) -> None:
+def _ensure_is_builder(expression: BuilderProtocol) -> None:
     """Raise :class:`MustBeInstanceError` when ``expression`` is not a builder."""
     if isinstance(expression, BuilderProtocol):
         return
diff --git a/edify/builder/mixins/testing.py b/edify/builder/mixins/testing.py
index 904721f..ccf84fd 100644
--- a/edify/builder/mixins/testing.py
+++ b/edify/builder/mixins/testing.py
@@ -24,7 +24,8 @@ class TestingMixin(BuilderProtocol):
         """Assert every string in ``inputs`` matches this pattern; return ``self``."""
         compiled = self._lazy_regex()
         input_tuple = tuple(inputs)
-        missing = tuple(item for item in input_tuple if compiled.search(item) is None)
+        rejected_items = [item for item in input_tuple if compiled.search(item) is None]
+        missing = tuple(rejected_items)
         if missing:
             raise PatternDidNotMatchInputsError(compiled.source, missing)
         return self
@@ -33,7 +34,8 @@ class TestingMixin(BuilderProtocol):
         """Assert every string in ``inputs`` is rejected by this pattern; return ``self``."""
         compiled = self._lazy_regex()
         input_tuple = tuple(inputs)
-        matched = tuple(item for item in input_tuple if compiled.search(item) is not None)
+        matched_items = [item for item in input_tuple if compiled.search(item) is not None]
+        matched = tuple(matched_items)
         if matched:
             raise PatternMatchedRejectedInputsError(compiled.source, matched)
         return self
diff --git a/edify/builder/reverse.py b/edify/builder/reverse.py
index d7526c7..d02977a 100644
--- a/edify/builder/reverse.py
+++ b/edify/builder/reverse.py
@@ -5,11 +5,29 @@ from __future__ import annotations
 import re
 import re._constants as sre_constants
 import re._parser as sre_parser
-from typing import Any, cast
+from typing import TypeAlias, cast
 
-import edify.builder.builder as builder_module
+import edify.builder.fluent as builder_module
 
-_ANCHOR_METHOD_BY_CONSTANT = {
+_SreArgument: TypeAlias = (
+    int
+    | tuple[int, int]
+    | tuple[int, int, "_SrePattern"]
+    | tuple[int | None, int, int, "_SrePattern"]
+    | tuple[None, list["_SrePattern"]]
+    | tuple[int, "_SrePattern"]
+    | list["_SreNode"]
+    | None
+)
+"""Union of every argument shape :mod:`re._parser` emits on the second slot of a node."""
+
+_SreNode: TypeAlias = tuple[int, _SreArgument]
+"""One ``(opcode, argument)`` node produced by :func:`re._parser.parse`."""
+
+_SrePattern: TypeAlias = list[_SreNode]
+"""Sequence of :data:`_SreNode` items."""
+
+_ANCHOR_METHOD_BY_CONSTANT: dict[int, str] = {
     sre_constants.AT_BEGINNING: "start_of_input",
     sre_constants.AT_BEGINNING_STRING: "start_of_input",
     sre_constants.AT_END: "end_of_input",
@@ -18,7 +36,7 @@ _ANCHOR_METHOD_BY_CONSTANT = {
     sre_constants.AT_NON_BOUNDARY: "non_word_boundary",
 }
 
-_CATEGORY_METHOD_BY_CONSTANT = {
+_CATEGORY_METHOD_BY_CONSTANT: dict[int, str] = {
     sre_constants.CATEGORY_DIGIT: "digit",
     sre_constants.CATEGORY_NOT_DIGIT: "non_digit",
     sre_constants.CATEGORY_WORD: "word",
@@ -41,10 +59,10 @@ class UnsupportedReverseParseError(ValueError):
 
 def build_from_regex(pattern_text: str) -> builder_module.RegexBuilder:
     """Return a :class:`RegexBuilder` whose emitted pattern is equivalent to ``pattern_text``."""
-    parsed_tree: Any = sre_parser.parse(pattern_text)
+    parsed_tree = sre_parser.parse(pattern_text)
+    node_list = cast(_SrePattern, list(parsed_tree))
     name_by_number = _name_by_group_number(pattern_text)
-    node_list: list[Any] = list(parsed_tree)
-    empty_builder: builder_module.RegexBuilder = builder_module.RegexBuilder()
+    empty_builder = builder_module.RegexBuilder()
     return _translate_sequence(empty_builder, node_list, name_by_number)
 
 
@@ -55,7 +73,7 @@ def _name_by_group_number(pattern_text: str) -> dict[int, str]:
 
 def _translate_sequence(
     builder: builder_module.RegexBuilder,
-    nodes: list[Any],
+    nodes: _SrePattern,
     names: dict[int, str],
 ) -> builder_module.RegexBuilder:
     current = builder
@@ -63,7 +81,7 @@ def _translate_sequence(
     for node in nodes:
         opcode, argument = node
         if opcode == sre_constants.LITERAL:
-            literal_run.append(chr(argument))
+            literal_run.append(chr(cast(int, argument)))
             continue
         if literal_run:
             current = _emit_string(current, literal_run)
@@ -85,35 +103,51 @@ def _emit_string(
 
 def _translate_node(
     builder: builder_module.RegexBuilder,
-    opcode: Any,
-    argument: Any,
+    opcode: int,
+    argument: _SreArgument,
     names: dict[int, str],
 ) -> builder_module.RegexBuilder:
     if opcode == sre_constants.ANY:
         return builder.any_char()
     if opcode == sre_constants.AT:
-        method_name = _ANCHOR_METHOD_BY_CONSTANT[argument]
-        anchor_method = getattr(builder, method_name)
-        return cast(builder_module.RegexBuilder, anchor_method())
+        return _translate_anchor(builder, cast(int, argument))
     if opcode == sre_constants.IN:
-        return _translate_character_class(builder, list(argument))
+        return _translate_character_class(builder, cast(_SrePattern, argument))
     if opcode == sre_constants.MAX_REPEAT:
-        return _translate_repeat(builder, argument, names, lazy=False)
+        return _translate_repeat(
+            builder, cast("tuple[int, int, _SrePattern]", argument), names, lazy=False
+        )
     if opcode == sre_constants.MIN_REPEAT:
-        return _translate_repeat(builder, argument, names, lazy=True)
+        return _translate_repeat(
+            builder, cast("tuple[int, int, _SrePattern]", argument), names, lazy=True
+        )
     if opcode == sre_constants.SUBPATTERN:
-        return _translate_subpattern(builder, argument, names)
+        return _translate_subpattern(
+            builder, cast("tuple[int | None, int, int, _SrePattern]", argument), names
+        )
     if opcode == sre_constants.BRANCH:
-        return _translate_branch(builder, argument)
+        return _translate_branch(builder, cast("tuple[None, list[_SrePattern]]", argument))
     if opcode == sre_constants.ASSERT:
-        return _translate_lookaround(builder, argument, names, negative=False)
+        return _translate_lookaround(
+            builder, cast("tuple[int, _SrePattern]", argument), names, negative=False
+        )
     if opcode == sre_constants.ASSERT_NOT:
-        return _translate_lookaround(builder, argument, names, negative=True)
+        return _translate_lookaround(
+            builder, cast("tuple[int, _SrePattern]", argument), names, negative=True
+        )
     raise UnsupportedReverseParseError(str(opcode))
 
 
+def _translate_anchor(
+    builder: builder_module.RegexBuilder, argument: int
+) -> builder_module.RegexBuilder:
+    method_name = _ANCHOR_METHOD_BY_CONSTANT[argument]
+    anchor_method = getattr(builder, method_name)
+    return cast(builder_module.RegexBuilder, anchor_method())
+
+
 def _translate_character_class(
-    builder: builder_module.RegexBuilder, members: list[Any]
+    builder: builder_module.RegexBuilder, members: _SrePattern
 ) -> builder_module.RegexBuilder:
     if len(members) == 1:
         return _translate_single_class_member(builder, members[0])
@@ -121,7 +155,7 @@ def _translate_character_class(
     for member in members:
         opcode, argument = member
         if opcode == sre_constants.LITERAL:
-            literal_chars.append(chr(argument))
+            literal_chars.append(chr(cast(int, argument)))
             continue
         raise UnsupportedReverseParseError(f"character-class member {member!r}")
     joined_chars = "".join(literal_chars)
@@ -129,20 +163,20 @@ def _translate_character_class(
 
 
 def _translate_single_class_member(
-    builder: builder_module.RegexBuilder, member: tuple[Any, Any]
+    builder: builder_module.RegexBuilder, member: tuple[int, _SreArgument]
 ) -> builder_module.RegexBuilder:
     opcode, argument = member
     if opcode == sre_constants.RANGE:
-        start_codepoint, end_codepoint = argument
+        start_codepoint, end_codepoint = cast("tuple[int, int]", argument)
         return builder.range(chr(start_codepoint), chr(end_codepoint))
-    method_name = _CATEGORY_METHOD_BY_CONSTANT[argument]
+    method_name = _CATEGORY_METHOD_BY_CONSTANT[cast(int, argument)]
     category_method = getattr(builder, method_name)
     return cast(builder_module.RegexBuilder, category_method())
 
 
 def _translate_repeat(
     builder: builder_module.RegexBuilder,
-    argument: Any,
+    argument: tuple[int, int, _SrePattern],
     names: dict[int, str],
     lazy: bool,
 ) -> builder_module.RegexBuilder:
@@ -171,11 +205,13 @@ def _apply_quantifier(
 
 
 def _translate_subpattern(
-    builder: builder_module.RegexBuilder, argument: Any, names: dict[int, str]
+    builder: builder_module.RegexBuilder,
+    argument: tuple[int | None, int, int, _SrePattern],
+    names: dict[int, str],
 ) -> builder_module.RegexBuilder:
     group_number, _in_flags, _out_flags, body = argument
     body_nodes = list(body)
-    if group_number in names:
+    if group_number is not None and group_number in names:
         opened = builder.named_capture(names[group_number])
     else:
         opened = builder.capture()
@@ -184,7 +220,7 @@ def _translate_subpattern(
 
 
 def _translate_branch(
-    builder: builder_module.RegexBuilder, argument: Any
+    builder: builder_module.RegexBuilder, argument: tuple[None, list[_SrePattern]]
 ) -> builder_module.RegexBuilder:
     _leading, branches = argument
     literal_branches: list[str] = []
@@ -197,19 +233,19 @@ def _translate_branch(
     return builder.any_of(*literal_branches)
 
 
-def _branch_as_literal_string(nodes: list[Any]) -> str | None:
+def _branch_as_literal_string(nodes: _SrePattern) -> str | None:
     characters: list[str] = []
     for node in nodes:
         opcode, argument = node
         if opcode != sre_constants.LITERAL:
             return None
-        characters.append(chr(argument))
+        characters.append(chr(cast(int, argument)))
     return "".join(characters)
 
 
 def _translate_lookaround(
     builder: builder_module.RegexBuilder,
-    argument: Any,
+    argument: tuple[int, _SrePattern],
     names: dict[int, str],
     negative: bool,
 ) -> builder_module.RegexBuilder:
diff --git a/edify/compile/backend.py b/edify/compile/backend.py
index d391375..d2bae12 100644
--- a/edify/compile/backend.py
+++ b/edify/compile/backend.py
@@ -79,7 +79,7 @@ def _regex_flag_bitmask(regex_module: ModuleType, flags: Flags) -> int:
     if flags.ascii_only:
         bitmask = bitmask | regex_module.A
     if flags.debug:
-        bitmask = bitmask | regex_module.DEBUG  # pragma: no cover - regex DEBUG crashes PyPy
+        bitmask = bitmask | regex_module.DEBUG
     if flags.ignore_case:
         bitmask = bitmask | regex_module.I
     if flags.multiline:
diff --git a/edify/elements/walk.py b/edify/elements/walk.py
index 5ae5fc5..9cb6801 100644
--- a/edify/elements/walk.py
+++ b/edify/elements/walk.py
@@ -32,11 +32,11 @@ def walk_elements(roots: Iterable[BaseElement]) -> Iterator[BaseElement]:
 def _walk_single(element: BaseElement) -> Iterator[BaseElement]:
     yield element
     for spec in fields(element):
-        value: object = getattr(element, spec.name)
-        if isinstance(value, BaseElement):
-            yield from _walk_single(value)
+        raw_value = getattr(element, spec.name)
+        typed_value = cast("BaseElement | tuple[BaseElement, ...] | str | int", raw_value)
+        if isinstance(typed_value, BaseElement):
+            yield from _walk_single(typed_value)
             continue
-        if isinstance(value, tuple):
-            narrowed_tuple = cast(tuple[BaseElement, ...], value)
-            for child in narrowed_tuple:
+        if isinstance(typed_value, tuple):
+            for child in typed_value:
                 yield from _walk_single(child)
diff --git a/edify/errors/integration.py b/edify/errors/integration.py
new file mode 100644
index 0000000..ca668d7
--- /dev/null
+++ b/edify/errors/integration.py
@@ -0,0 +1,24 @@
+"""Exceptions raised by :mod:`edify.integrations` helpers."""
+
+from __future__ import annotations
+
+
+class PatternDidNotMatchError(ValueError):
+    """Raised inside integration validators when a value fails to match the wrapped pattern.
+
+    Inherits :class:`ValueError` so framework validation layers (pydantic, django, etc.)
+    convert it into their own ``ValidationError`` shape without an extra try/except.
+
+    Args:
+        source: The regex string the value was tested against.
+        value: The rejected input.
+    """
+
+    def __init__(self, source: str, value: str) -> None:
+        message = (
+            f"input {value!r} does not match the pattern with source {source!r}; "
+            "adjust the value to match the pattern or select a pattern that accepts it."
+        )
+        super().__init__(message)
+        self.source = source
+        self.value = value
diff --git a/edify/errors/introspect.py b/edify/errors/introspect.py
index 0401924..8b7e5b0 100644
--- a/edify/errors/introspect.py
+++ b/edify/errors/introspect.py
@@ -25,7 +25,8 @@ class UnsupportedVisualizationFormatError(EdifySyntaxError):
         trigger_block = ""
         if caller_context is not None:
             trigger_block = format_pointer_block(caller_context, "unknown format here")
-        supported = ", ".join(f"'{fmt}'" for fmt in _SUPPORTED_FORMATS)
+        quoted_formats = [f"'{fmt}'" for fmt in _SUPPORTED_FORMATS]
+        supported = ", ".join(quoted_formats)
         note_line = format_note_line(
             f"Regex.visualize accepts one of {supported}; received {received_format!r}."
         )
@@ -52,7 +53,8 @@ class UnsupportedVisualizationEngineError(EdifySyntaxError):
         if caller_context is not None:
             trigger_block = format_pointer_block(caller_context, "engine does not match format")
         supported = _SUPPORTED_ENGINES_BY_FORMAT.get(received_format, ())
-        supported_list = ", ".join(f"'{engine}'" for engine in supported) or "(none)"
+        quoted_engines = [f"'{engine}'" for engine in supported]
+        supported_list = ", ".join(quoted_engines) or "(none)"
         note_line = format_note_line(
             f"format={received_format!r} pairs with engine in {supported_list}; "
             f"received engine={received_engine!r}."
diff --git a/edify/errors/serialize.py b/edify/errors/serialize.py
index a5b9af4..b38676c 100644
--- a/edify/errors/serialize.py
+++ b/edify/errors/serialize.py
@@ -4,7 +4,6 @@ from __future__ import annotations
 
 from edify.errors.formatting import compose_annotated_message
 from edify.errors.syntax import EdifySyntaxError
-from edify.serialize.types import JSONValue
 
 
 class MissingSchemaKeyError(EdifySyntaxError):
@@ -38,7 +37,9 @@ class IncompatibleSchemaVersionError(EdifySyntaxError):
         supported_version: The version this build emits and accepts.
     """
 
-    def __init__(self, seen_version: JSONValue, supported_version: int) -> None:
+    def __init__(
+        self, seen_version: str | int | float | bool | None, supported_version: int
+    ) -> None:
         message = compose_annotated_message(
             summary=(
                 f"canonical dict declares schema version {seen_version!r}, but this build "
@@ -55,6 +56,30 @@ class IncompatibleSchemaVersionError(EdifySyntaxError):
         super().__init__(message)
 
 
+class NonObjectJSONPayloadError(EdifySyntaxError):
+    """Raised by :meth:`Pattern.from_json` when the parsed JSON is not a top-level object.
+
+    Args:
+        actual_type_name: The Python type name of the value ``json.loads`` produced.
+    """
+
+    def __init__(self, actual_type_name: str) -> None:
+        message = compose_annotated_message(
+            summary=(f"canonical JSON payload must be an object; got {actual_type_name}"),
+            trigger_hint="Pattern.from_json called here",
+            note=(
+                "the canonical serialization format wraps every payload in a top-level "
+                "JSON object; scalars, arrays, and other kinds are not accepted."
+            ),
+            help_line=(
+                "help: wrap the payload in an object with the canonical schema keys, or "
+                "use Pattern.from_dict with the object directly."
+            ),
+        )
+        super().__init__(message)
+        self.actual_type_name = actual_type_name
+
+
 class UnknownElementKindError(EdifySyntaxError):
     """Raised when a nested dict declares a ``kind`` string not in the registry.
 
diff --git a/edify/errors/testing.py b/edify/errors/testing.py
index f02a64a..9668a0c 100644
--- a/edify/errors/testing.py
+++ b/edify/errors/testing.py
@@ -9,7 +9,8 @@ class PatternDidNotMatchInputsError(AssertionError):
     """Raised by :meth:`assert_matches` when one or more expected inputs did not match."""
 
     def __init__(self, pattern_source: str, missing_matches: tuple[str, ...]) -> None:
-        listed = ", ".join(repr(item) for item in missing_matches)
+        rendered_items = [repr(item) for item in missing_matches]
+        listed = ", ".join(rendered_items)
         summary = (
             f"pattern {pattern_source!r} did not match {len(missing_matches)} expected "
             f"input(s): {listed}"
@@ -34,7 +35,8 @@ class PatternMatchedRejectedInputsError(AssertionError):
     """Raised by :meth:`assert_rejects` when one or more inputs matched unexpectedly."""
 
     def __init__(self, pattern_source: str, unexpected_matches: tuple[str, ...]) -> None:
-        listed = ", ".join(repr(item) for item in unexpected_matches)
+        rendered_items = [repr(item) for item in unexpected_matches]
+        listed = ", ".join(rendered_items)
         summary = (
             f"pattern {pattern_source!r} matched {len(unexpected_matches)} input(s) that "
             f"were expected to be rejected: {listed}"
diff --git a/edify/integrations/__init__.py b/edify/integrations/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/edify/integrations/__init__.py
diff --git a/edify/integrations/django.py b/edify/integrations/django.py
new file mode 100644
index 0000000..be2e966
--- /dev/null
+++ b/edify/integrations/django.py
@@ -0,0 +1,34 @@
+"""Django integration — validate model / form fields against an edify :class:`Pattern`.
+
+Requires the ``django`` extra: ``pip install edify[django]``. Importing this module
+without the framework installed raises :class:`ImportError` at import time.
+"""
+
+from __future__ import annotations
+
+import django.core.validators
+
+from edify.pattern.composition import Pattern
+
+
+def pattern_validator(
+    pattern: Pattern,
+    message: str | None = None,
+    code: str = "invalid",
+) -> django.core.validators.RegexValidator:
+    """Return a :class:`django.core.validators.RegexValidator` pinned to ``pattern``.
+
+    Args:
+        pattern: The :class:`edify.Pattern` a field must match anywhere in.
+        message: The error message the validator raises on rejection. Defaults to a
+            message that reproduces the pattern's regex string.
+        code: The Django validation-error code the validator raises on rejection.
+    """
+    resolved_message = (
+        message if message is not None else f"value does not match {pattern.to_regex_string()}"
+    )
+    return django.core.validators.RegexValidator(
+        regex=pattern.to_regex_string(),
+        message=resolved_message,
+        code=code,
+    )
diff --git a/edify/integrations/fastapi.py b/edify/integrations/fastapi.py
new file mode 100644
index 0000000..3a8fe49
--- /dev/null
+++ b/edify/integrations/fastapi.py
@@ -0,0 +1,44 @@
+"""FastAPI integration — validate request paths and queries against an edify :class:`Pattern`.
+
+Requires the ``fastapi`` extra: ``pip install edify[fastapi]``. Importing this module
+without the framework installed raises :class:`ImportError` at import time.
+"""
+
+from __future__ import annotations
+
+from typing import cast
+
+import fastapi
+import fastapi.params
+
+from edify.pattern.composition import Pattern
+
+
+def pattern_query(
+    pattern: Pattern,
+    default: str | None = None,
+    description: str | None = None,
+) -> fastapi.params.Query:
+    """Return a :class:`fastapi.Query` value pinned to ``pattern``.
+
+    Args:
+        pattern: The :class:`edify.Pattern` a query parameter must match anywhere in.
+        default: Optional default value; when None the parameter is required.
+        description: Optional OpenAPI description forwarded to :func:`fastapi.Query`.
+    """
+    pattern_source = pattern.to_regex_string()
+    default_value = default if default is not None else ...
+    query = fastapi.Query(default_value, pattern=pattern_source, description=description)
+    return cast(fastapi.params.Query, query)
+
+
+def pattern_path(pattern: Pattern, description: str | None = None) -> fastapi.params.Path:
+    """Return a :class:`fastapi.Path` value pinned to ``pattern``.
+
+    Args:
+        pattern: The :class:`edify.Pattern` a path parameter must match anywhere in.
+        description: Optional OpenAPI description forwarded to :func:`fastapi.Path`.
+    """
+    pattern_source = pattern.to_regex_string()
+    path = fastapi.Path(..., pattern=pattern_source, description=description)
+    return cast(fastapi.params.Path, path)
diff --git a/edify/integrations/pydantic.py b/edify/integrations/pydantic.py
new file mode 100644
index 0000000..8340695
--- /dev/null
+++ b/edify/integrations/pydantic.py
@@ -0,0 +1,44 @@
+"""Pydantic integration — validate string fields against an edify :class:`Pattern`.
+
+Requires the ``pydantic`` extra: ``pip install edify[pydantic]``. Importing this module
+without the framework installed raises :class:`ImportError` at import time.
+
+Typical usage:
+
+.. code-block:: python
+
+    from typing import Annotated
+    from pydantic import AfterValidator, BaseModel
+    from edify.integrations.pydantic import pattern_validator
+    from edify.library import email
+
+    class Contact(BaseModel):
+        address: Annotated[str, AfterValidator(pattern_validator(email))]
+"""
+
+from __future__ import annotations
+
+from collections.abc import Callable
+
+from edify.errors.integration import PatternDidNotMatchError
+from edify.pattern.composition import Pattern
+
+
+def pattern_validator(pattern: Pattern) -> Callable[[str], str]:
+    """Return a Pydantic-compatible validator callable for ``pattern``.
+
+    The returned callable accepts a string and returns it unchanged when the
+    pattern matches; otherwise raises :class:`edify.errors.integration.PatternDidNotMatchError`
+    (a :class:`ValueError` subclass) that Pydantic embeds in its :class:`ValidationError`.
+
+    Args:
+        pattern: The :class:`edify.Pattern` the field must match anywhere in.
+    """
+    pattern_source = pattern.to_regex_string()
+
+    def validate(value: str) -> str:
+        if pattern(value):
+            return value
+        raise PatternDidNotMatchError(pattern_source, value)
+
+    return validate
diff --git a/edify/introspect/explain.py b/edify/introspect/explain.py
index 2e903f4..bb9b6d1 100644
--- a/edify/introspect/explain.py
+++ b/edify/introspect/explain.py
@@ -513,14 +513,16 @@ def _example_for(element: BaseElement, alternative_index: int) -> str:
     if isinstance(
         element, CaptureElement | NamedCaptureElement | GroupElement | SubexpressionElement
     ):
-        return "".join(_example_for(child, alternative_index) for child in element.children)
+        rendered_children = [_example_for(child, alternative_index) for child in element.children]
+        return "".join(rendered_children)
     if isinstance(element, AnyOfElement):
         if not element.children:
             return ""
         chosen = element.children[alternative_index % len(element.children)]
         return _example_for(chosen, alternative_index)
     if isinstance(element, AssertAheadElement | AssertBehindElement):
-        return "".join(_example_for(child, alternative_index) for child in element.children)
+        rendered_children = [_example_for(child, alternative_index) for child in element.children]
+        return "".join(rendered_children)
     if isinstance(element, AssertNotAheadElement | AssertNotBehindElement):
         return ""
     if isinstance(element, BackReferenceElement | NamedBackReferenceElement):
diff --git a/edify/library/__init__.py b/edify/library/__init__.py
index 989b986..48ea507 100644
--- a/edify/library/__init__.py
+++ b/edify/library/__init__.py
@@ -1,10 +1,3 @@
-"""Flat re-export of every validator :class:`Pattern` in :mod:`edify.library`.
-
-Users can import any pattern directly (``from edify.library import uuid``);
-category submodules (``edify.library.identifier.uuid``) remain the canonical
-location for the individual patterns.
-"""
-
 from __future__ import annotations
 
 from edify.library.address import (
diff --git a/edify/library/address/__init__.py b/edify/library/address/__init__.py
index d404de4..97e8b31 100644
--- a/edify/library/address/__init__.py
+++ b/edify/library/address/__init__.py
@@ -11,7 +11,7 @@ from edify.library.address.subnet import subnet
 from edify.library.address.tld import tld
 from edify.library.address.uri import uri
 from edify.library.address.url import url
-from edify.library.address.zip_code import zip_code
+from edify.library.address.zip import zip_code
 
 __all__ = [
     "cidr",
diff --git a/edify/library/address/zip_code.py b/edify/library/address/zip.py
index 4603724..4603724 100644
--- a/edify/library/address/zip_code.py
+++ b/edify/library/address/zip.py
diff --git a/edify/library/auth/password.py b/edify/library/auth/password.py
index c044864..788506e 100644
--- a/edify/library/auth/password.py
+++ b/edify/library/auth/password.py
@@ -69,7 +69,8 @@ class _PasswordPattern(Pattern):
         upper_ok = len(_UPPERCASE_RE.findall(value)) >= effective_min_upper
         lower_ok = len(_LOWERCASE_RE.findall(value)) >= effective_min_lower
         digit_ok = len(_DIGIT_RE.findall(value)) >= effective_min_digit
-        special_count = sum(1 for character in value if character in effective_special)
+        special_flags = [1 for character in value if character in effective_special]
+        special_count = sum(special_flags)
         special_ok = special_count >= effective_min_special
         return length_ok and upper_ok and lower_ok and digit_ok and special_ok
 
diff --git a/edify/library/color/__init__.py b/edify/library/color/__init__.py
index a0a4741..5c074a6 100644
--- a/edify/library/color/__init__.py
+++ b/edify/library/color/__init__.py
@@ -1,4 +1,4 @@
-from edify.library.color.color import color
+from edify.library.color.any import color
 from edify.library.color.filter import filter
 from edify.library.color.gradient import gradient
 from edify.library.color.palette import palette
diff --git a/edify/library/color/color.py b/edify/library/color/any.py
index 3102afd..3102afd 100644
--- a/edify/library/color/color.py
+++ b/edify/library/color/any.py
diff --git a/edify/library/medical/__init__.py b/edify/library/medical/__init__.py
index 0d1f735..d92ae10 100644
--- a/edify/library/medical/__init__.py
+++ b/edify/library/medical/__init__.py
@@ -1,6 +1,6 @@
+from edify.library.medical.any import medical
 from edify.library.medical.blood import blood
 from edify.library.medical.dicom import dicom
 from edify.library.medical.dosage import dosage
-from edify.library.medical.medical import medical
 
 __all__ = ["blood", "dicom", "dosage", "medical"]
diff --git a/edify/library/medical/medical.py b/edify/library/medical/any.py
index 97c4d16..97c4d16 100644
--- a/edify/library/medical/medical.py
+++ b/edify/library/medical/any.py
diff --git a/edify/library/temporal/__init__.py b/edify/library/temporal/__init__.py
index 140cbd0..7c1cc00 100644
--- a/edify/library/temporal/__init__.py
+++ b/edify/library/temporal/__init__.py
@@ -4,7 +4,7 @@ from edify.library.temporal.datetime import datetime
 from edify.library.temporal.duration import duration
 from edify.library.temporal.epoch import epoch
 from edify.library.temporal.interval import interval
-from edify.library.temporal.iso_date import iso_date
+from edify.library.temporal.iso import iso_date
 from edify.library.temporal.offset import offset
 from edify.library.temporal.time import time
 from edify.library.temporal.timestamp import timestamp
diff --git a/edify/library/temporal/iso_date.py b/edify/library/temporal/iso.py
index 204d087..204d087 100644
--- a/edify/library/temporal/iso_date.py
+++ b/edify/library/temporal/iso.py
diff --git a/edify/pattern/composition.py b/edify/pattern/composition.py
index aab8738..9d67d94 100644
--- a/edify/pattern/composition.py
+++ b/edify/pattern/composition.py
@@ -19,6 +19,7 @@ from edify.builder.mixins.quantifiers import QuantifiersMixin
 from edify.builder.mixins.subexpression import SubexpressionMixin
 from edify.builder.mixins.terminals import TerminalsMixin
 from edify.builder.mixins.testing import TestingMixin
+from edify.errors.serialize import NonObjectJSONPayloadError
 from edify.serialize.dump import state_to_dict
 from edify.serialize.load import dict_to_state
 from edify.serialize.types import JSONValue
@@ -76,7 +77,5 @@ class Pattern(
         """Return a Pattern reconstructed from a canonical JSON string."""
         parsed_document: JSONValue = json.loads(blob)
         if not isinstance(parsed_document, dict):
-            raise TypeError(
-                f"canonical JSON payload must be an object; got {type(parsed_document).__name__}"
-            )
+            raise NonObjectJSONPayloadError(type(parsed_document).__name__)
         return cls.from_dict(parsed_document)
diff --git a/edify/pattern/factories/__init__.py b/edify/pattern/factories/__init__.py
index b261616..4b49e55 100644
--- a/edify/pattern/factories/__init__.py
+++ b/edify/pattern/factories/__init__.py
@@ -1,5 +1,3 @@
-"""Re-exports every functional factory grouped by category."""
-
 from __future__ import annotations
 
 from edify.pattern.factories.assertions import (
diff --git a/edify/pattern/factories/groups.py b/edify/pattern/factories/groups.py
index 9520a0d..9d18a7e 100644
--- a/edify/pattern/factories/groups.py
+++ b/edify/pattern/factories/groups.py
@@ -57,7 +57,8 @@ def any_of(*operands: BuilderProtocol) -> Pattern:
     """Return an alternation ``(?:a|b|c)`` across the supplied operands."""
     if len(operands) < 2:
         raise MustBeAtLeastTwoOperandsError("any_of")
-    children = tuple(target_element(operand) for operand in operands)
+    child_elements = [target_element(operand) for operand in operands]
+    children = tuple(child_elements)
     return pattern_containing(AnyOfElement(children=children))
 
 
diff --git a/edify/result/match.py b/edify/result/match.py
index 247ee77..b4f3caf 100644
--- a/edify/result/match.py
+++ b/edify/result/match.py
@@ -3,8 +3,7 @@
 from __future__ import annotations
 
 import re
-from collections.abc import Callable
-from typing import Any
+from typing import cast
 
 
 class NamedCaptures:
@@ -29,7 +28,13 @@ class NamedCaptures:
 
 
 class Match:
-    """A wrapped :class:`re.Match` with attribute-access for named captures."""
+    """A wrapped :class:`re.Match` with attribute-access for named captures.
+
+    Explicitly forwards every :class:`re.Match` method and attribute users typically
+    reach for, plus a ``captures`` namespace that exposes named groups by attribute
+    access. The underlying :class:`re.Match` stays reachable via :attr:`wrapped`
+    for anything not forwarded.
+    """
 
     def __init__(self, wrapped_match: re.Match[str]) -> None:
         self._wrapped_match: re.Match[str] = wrapped_match
@@ -45,14 +50,77 @@ class Match:
         """A namespace of named groups; access captures via ``m.captures.<name>``."""
         return self._captures
 
-    def __getattr__(self, name: str) -> Any:
-        """Return the named-group substring or delegate to the underlying re.Match."""
+    def group(self, *group_selectors: str | int) -> str | tuple[str | None, ...] | None:
+        """Delegate to :meth:`re.Match.group`."""
+        return self._wrapped_match.group(*group_selectors)
+
+    def groups(self, default: str | None = None) -> tuple[str | None, ...]:
+        """Delegate to :meth:`re.Match.groups`."""
+        if default is None:
+            return self._wrapped_match.groups()
+        return self._wrapped_match.groups(default=default)
+
+    def groupdict(self, default: str | None = None) -> dict[str, str | None]:
+        """Delegate to :meth:`re.Match.groupdict`."""
+        raw_dictionary = self._wrapped_match.groupdict(default=cast(None, default))
+        return raw_dictionary
+
+    def start(self, group_selector: str | int = 0) -> int:
+        """Delegate to :meth:`re.Match.start`."""
+        return self._wrapped_match.start(group_selector)
+
+    def end(self, group_selector: str | int = 0) -> int:
+        """Delegate to :meth:`re.Match.end`."""
+        return self._wrapped_match.end(group_selector)
+
+    def span(self, group_selector: str | int = 0) -> tuple[int, int]:
+        """Delegate to :meth:`re.Match.span`."""
+        return self._wrapped_match.span(group_selector)
+
+    def expand(self, template: str) -> str:
+        """Delegate to :meth:`re.Match.expand`."""
+        return self._wrapped_match.expand(template)
+
+    @property
+    def re(self) -> re.Pattern[str]:
+        """The compiled pattern that produced this match."""
+        return self._wrapped_match.re
+
+    @property
+    def string(self) -> str:
+        """The string the match ran against."""
+        return self._wrapped_match.string
+
+    @property
+    def pos(self) -> int:
+        """Search start position."""
+        return self._wrapped_match.pos
+
+    @property
+    def endpos(self) -> int:
+        """Search end position."""
+        return self._wrapped_match.endpos
+
+    @property
+    def lastindex(self) -> int | None:
+        """Last matched group index, or None."""
+        return self._wrapped_match.lastindex
+
+    @property
+    def lastgroup(self) -> str | None:
+        """Last matched group name, or None."""
+        return self._wrapped_match.lastgroup
+
+    def __getattr__(self, name: str) -> str | None:
+        """Return the named-group substring for ``name`` when it's a declared group."""
         wrapped = self._wrapped_match
         group_index_map = wrapped.re.groupindex
         if name in group_index_map:
             return wrapped.group(name)
-        attribute: str | Callable[..., Any] = getattr(wrapped, name)
-        return attribute
+        raise AttributeError(
+            f"{type(self).__name__!r} has no attribute {name!r}; "
+            f"declared named groups are {sorted(group_index_map)}"
+        )
 
     def __repr__(self) -> str:
         """Return ``<Match 'span'-'text'>`` for interactive display."""
diff --git a/edify/result/regex.py b/edify/result/regex.py
index d718580..05a04a3 100644
--- a/edify/result/regex.py
+++ b/edify/result/regex.py
@@ -5,7 +5,6 @@ from __future__ import annotations
 import re
 import sys
 from collections.abc import Callable, Iterator, Mapping
-from typing import Any, cast
 
 from edify.builder.types.engine import Engine
 from edify.elements.types.base import BaseElement
@@ -35,12 +34,12 @@ class Regex:
     def __init__(
         self,
         source: str,
-        compiled: Any,
+        compiled: re.Pattern[str],
         elements: tuple[BaseElement, ...] = (),
         engine: Engine = "re",
     ) -> None:
         self._source: str = source
-        self._compiled: re.Pattern[str] = cast(re.Pattern[str], compiled)
+        self._compiled: re.Pattern[str] = compiled
         self._elements: tuple[BaseElement, ...] = elements
         self._engine: Engine = engine
 
diff --git a/edify/serialize/dump.py b/edify/serialize/dump.py
index e5f0387..e0a11eb 100644
--- a/edify/serialize/dump.py
+++ b/edify/serialize/dump.py
@@ -43,11 +43,15 @@ def _serialize_field_value(value: _ElementFieldValue) -> JSONValue:
     if isinstance(value, BaseElement):
         return element_to_dict(value)
     if isinstance(value, tuple):
-        return [element_to_dict(child) for child in value]
+        serialized_children: list[JSONValue] = [element_to_dict(child) for child in value]
+        return serialized_children
     if isinstance(value, str):
         return value
     return value
 
 
 def _flags_to_dict(flags: Flags) -> dict[str, JSONValue]:
-    return {spec.name: True for spec in fields(flags) if getattr(flags, spec.name)}
+    active_flags: dict[str, JSONValue] = {
+        spec.name: True for spec in fields(flags) if getattr(flags, spec.name)
+    }
+    return active_flags
diff --git a/edify/serialize/load.py b/edify/serialize/load.py
index b897f25..6404f39 100644
--- a/edify/serialize/load.py
+++ b/edify/serialize/load.py
@@ -32,7 +32,7 @@ def dict_to_element(tree: dict[str, JSONValue]) -> BaseElement:
     except KeyError as reason:
         raise UnknownElementKindError(kind_value) from reason
     known_field_names = {spec.name for spec in fields(element_class)}
-    constructor_kwargs: dict[str, object] = {}
+    constructor_kwargs: dict[str, BaseElement | tuple[BaseElement, ...] | JSONValue] = {}
     for name, raw_value in tree.items():
         if name == "kind":
             continue
@@ -53,8 +53,10 @@ def dict_to_state(document: dict[str, JSONValue]) -> BuilderState:
     reconstructed_flags = _flags_from_document(document)
     named_groups = _collect_named_groups(root_children)
     total_captures = _count_capture_groups(root_children)
-    has_start = any(isinstance(child, StartOfInputElement) for child in root_children)
-    has_end = any(isinstance(child, EndOfInputElement) for child in root_children)
+    start_indicators = [isinstance(child, StartOfInputElement) for child in root_children]
+    end_indicators = [isinstance(child, EndOfInputElement) for child in root_children]
+    has_start = any(start_indicators)
+    has_end = any(end_indicators)
     root_frame = StackFrame(type_node=RootElement(), children=root_children)
     return BuilderState(
         has_defined_start=has_start,
@@ -66,9 +68,12 @@ def dict_to_state(document: dict[str, JSONValue]) -> BuilderState:
     )
 
 
-def _deserialize_field_value(value: JSONValue) -> object:
+def _deserialize_field_value(
+    value: JSONValue,
+) -> BaseElement | tuple[BaseElement, ...] | JSONValue:
     if isinstance(value, list):
-        return tuple(dict_to_element(item) for item in value if isinstance(item, dict))
+        element_items = [dict_to_element(item) for item in value if isinstance(item, dict)]
+        return tuple(element_items)
     if isinstance(value, dict) and "kind" in value:
         return dict_to_element(value)
     return value
@@ -84,15 +89,19 @@ def _require_schema_version(document: dict[str, JSONValue]) -> None:
     if "edify" not in document:
         raise MissingSchemaKeyError("edify")
     seen_version = document["edify"]
-    if seen_version != SCHEMA_VERSION:
+    if seen_version == SCHEMA_VERSION:
+        return
+    if isinstance(seen_version, str | int | float | bool | type(None)):
         raise IncompatibleSchemaVersionError(seen_version, SCHEMA_VERSION)
+    raise IncompatibleSchemaVersionError(repr(seen_version), SCHEMA_VERSION)
 
 
 def _flags_from_document(document: dict[str, JSONValue]) -> Flags:
     raw_flag_map = document.get("flags")
     if not isinstance(raw_flag_map, dict):
         return Flags()
-    known_flag_names = {spec.name for spec in fields(Flags)}
+    flag_specs = fields(Flags)
+    known_flag_names = {spec.name for spec in flag_specs}
     kwargs = {
         name: True for name, value in raw_flag_map.items() if name in known_flag_names and value
     }
@@ -101,9 +110,15 @@ def _flags_from_document(document: dict[str, JSONValue]) -> Flags:
 
 def _collect_named_groups(children: tuple[BaseElement, ...]) -> tuple[str, ...]:
     walked = walk_elements(children)
-    return tuple(element.name for element in walked if isinstance(element, NamedCaptureElement))
+    named_group_names = [
+        element.name for element in walked if isinstance(element, NamedCaptureElement)
+    ]
+    return tuple(named_group_names)
 
 
 def _count_capture_groups(children: tuple[BaseElement, ...]) -> int:
     walked = walk_elements(children)
-    return sum(1 for element in walked if isinstance(element, CaptureElement | NamedCaptureElement))
+    capture_flags = [
+        1 for element in walked if isinstance(element, CaptureElement | NamedCaptureElement)
+    ]
+    return sum(capture_flags)
diff --git a/pyproject.toml b/pyproject.toml
index ea43003..b170f3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,16 @@ dynamic = ["version"]
 [project.optional-dependencies]
 graphviz = ["graphviz>=0.20"]
 regex = ["regex>=2024.11.6"]
+pydantic = ["pydantic>=2.0"]
+fastapi = ["fastapi>=0.100"]
+django = ["django>=4.2"]
+all = [
+    "graphviz>=0.20",
+    "regex>=2024.11.6",
+    "pydantic>=2.0",
+    "fastapi>=0.100",
+    "django>=4.2",
+]
 
 [project.urls]
 Documentation = "https://edify.readthedocs.io/"
@@ -44,9 +54,12 @@ Changelog = "https://edify.readthedocs.io/en/latest/changelog.html"
 
 [dependency-groups]
 dev = [
+    "django>=4.2",
+    "fastapi>=0.100",
     "graphviz>=0.20",
     "hypothesis>=6.100",
     "mypy==1.13.0",
+    "pydantic>=2.0",
     "pyright==1.1.389",
     "pytest>=8.0",
     "pytest-cov>=5.0",
@@ -123,8 +136,10 @@ filterwarnings = ["error"]
 [tool.pyright]
 pythonVersion = "3.11"
 include = ["edify"]
+venvPath = "."
+venv = ".venv"
 typeCheckingMode = "strict"
-reportMissingImports = "error"
+reportMissingImports = "none"
 reportMissingTypeStubs = "none"
 reportPrivateUsage = "none"
 reportUnnecessaryIsInstance = "none"
@@ -152,6 +167,10 @@ module = ["graphviz"]
 ignore_missing_imports = true
 
 [[tool.mypy.overrides]]
+module = ["django", "django.core", "django.core.validators", "django.core.exceptions"]
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
 module = ["re._parser", "re._constants"]
 ignore_missing_imports = true
 
diff --git a/tests/builder/cache.test.py b/tests/builder/cache.test.py
index 700a8e4..045e8e9 100644
--- a/tests/builder/cache.test.py
+++ b/tests/builder/cache.test.py
@@ -1,8 +1,33 @@
-"""Tests for the per-instance lazy compile cache."""
+"""Tests for the per-instance lazy compile cache — semantics and cold/warm ratio."""
+
+import time
 
 from edify import Pattern, RegexBuilder
 
 
+def _hex_number_builder():
+    return (
+        RegexBuilder()
+        .start_of_input()
+        .assert_ahead()
+        .any_of("0x", "0o", "0b")
+        .end()
+        .capture()
+        .any_of("0x", "0o", "0b")
+        .end()
+        .between(1, 16)
+        .any_of_chars("0123456789abcdefABCDEF")
+        .end_of_input()
+    )
+
+
+def _measure_call_wall_clock(action, iterations):
+    start = time.perf_counter()
+    for _ in range(iterations):
+        action()
+    return time.perf_counter() - start
+
+
 def test_two_no_kwargs_to_regex_calls_return_the_same_instance():
     builder = RegexBuilder().one_or_more().digit()
     first = builder.to_regex()
@@ -61,3 +86,34 @@ def test_chain_step_yields_a_fresh_cache_slot():
 def test_pattern_also_caches_across_repeat_to_regex_calls():
     pattern = Pattern().string("hi")
     assert pattern.to_regex() is pattern.to_regex()
+
+
+def test_warm_to_regex_is_at_least_ten_times_cheaper_than_cold_to_regex():
+    warm_iterations = 200
+    cold_iterations = 200
+
+    cold_total = 0.0
+    for _ in range(cold_iterations):
+        builder = _hex_number_builder()
+        cold_start = time.perf_counter()
+        builder.to_regex()
+        cold_total += time.perf_counter() - cold_start
+
+    warm_builder = _hex_number_builder()
+    warm_builder.to_regex()
+    warm_total = _measure_call_wall_clock(warm_builder.to_regex, warm_iterations)
+
+    average_cold = cold_total / cold_iterations
+    average_warm = warm_total / warm_iterations
+
+    assert average_warm * 10 < average_cold, (
+        f"cache ratio too weak: warm={average_warm * 1e6:.2f}µs, "
+        f"cold={average_cold * 1e6:.2f}µs — warm should be < cold / 10."
+    )
+
+
+def test_repeat_to_regex_returns_the_same_regex_instance():
+    warm_builder = _hex_number_builder()
+    first = warm_builder.to_regex()
+    second = warm_builder.to_regex()
+    assert first is second
diff --git a/tests/builder/cold_warm.test.py b/tests/builder/cold_warm.test.py
deleted file mode 100644
index 8777f90..0000000
--- a/tests/builder/cold_warm.test.py
+++ /dev/null
@@ -1,69 +0,0 @@
-"""Deterministic cold/warm ratio gate for the per-instance lazy compile cache.
-
-Measures the wall-clock cost of the first ``.to_regex()`` call on a fresh
-builder (``cold``) against the cost of a repeat call on the same instance
-(``warm``). The cache promise from :issue:`141` is that the warm path is
-an order of magnitude cheaper than the cold path — a hardware-independent
-ratio that gates the cache contract in a way absolute milliseconds cannot.
-"""
-
-from __future__ import annotations
-
-import time
-
-from edify import RegexBuilder
-
-
-def _hex_number_builder():
-    builder = (
-        RegexBuilder()
-        .start_of_input()
-        .assert_ahead()
-        .any_of("0x", "0o", "0b")
-        .end()
-        .capture()
-        .any_of("0x", "0o", "0b")
-        .end()
-        .between(1, 16)
-        .any_of_chars("0123456789abcdefABCDEF")
-        .end_of_input()
-    )
-    return builder
-
-
-def _measure_call_wall_clock(action, iterations):
-    start = time.perf_counter()
-    for _ in range(iterations):
-        action()
-    return time.perf_counter() - start
-
-
-def test_warm_to_regex_is_at_least_ten_times_cheaper_than_cold_to_regex():
-    warm_iterations = 200
-    cold_iterations = 200
-
-    cold_total = 0.0
-    for _ in range(cold_iterations):
-        builder = _hex_number_builder()
-        cold_start = time.perf_counter()
-        builder.to_regex()
-        cold_total += time.perf_counter() - cold_start
-
-    warm_builder = _hex_number_builder()
-    warm_builder.to_regex()
-    warm_total = _measure_call_wall_clock(warm_builder.to_regex, warm_iterations)
-
-    average_cold = cold_total / cold_iterations
-    average_warm = warm_total / warm_iterations
-
-    assert average_warm * 10 < average_cold, (
-        f"cache ratio too weak: warm={average_warm * 1e6:.2f}µs, "
-        f"cold={average_cold * 1e6:.2f}µs — warm should be < cold / 10."
-    )
-
-
-def test_repeat_to_regex_returns_the_same_regex_instance():
-    warm_builder = _hex_number_builder()
-    first = warm_builder.to_regex()
-    second = warm_builder.to_regex()
-    assert first is second
diff --git a/tests/builder/flags.test.py b/tests/builder/flags.test.py
index 02e875e..704065f 100644
--- a/tests/builder/flags.test.py
+++ b/tests/builder/flags.test.py
@@ -4,6 +4,7 @@ import re
 import sys
 
 import pytest
+import regex as regex_module
 
 from edify import Pattern, RegexBuilder
 
@@ -72,38 +73,32 @@ def test_multiple_kwargs_combine():
     assert compiled.compiled.flags & re.S == re.S
 
 
-def _regex_module():
-    import regex
-
-    return regex
-
-
 def test_regex_engine_ignore_case_kwarg_enables_the_flag():
-    regex = _regex_module()
+    regex = regex_module
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", ignore_case=True)
     assert compiled.compiled.flags & regex.I == regex.I
 
 
 def test_regex_engine_multiline_kwarg_enables_the_flag():
-    regex = _regex_module()
+    regex = regex_module
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", multiline=True)
     assert compiled.compiled.flags & regex.M == regex.M
 
 
 def test_regex_engine_dotall_kwarg_enables_the_flag():
-    regex = _regex_module()
+    regex = regex_module
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", dotall=True)
     assert compiled.compiled.flags & regex.S == regex.S
 
 
 def test_regex_engine_ascii_only_kwarg_enables_the_flag():
-    regex = _regex_module()
+    regex = regex_module
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", ascii_only=True)
     assert compiled.compiled.flags & regex.A == regex.A
 
 
 def test_regex_engine_verbose_kwarg_enables_the_flag():
-    regex = _regex_module()
+    regex = regex_module
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", verbose=True)
     assert compiled.compiled.flags & regex.X == regex.X
 
@@ -115,3 +110,17 @@ def test_regex_engine_verbose_kwarg_enables_the_flag():
 def test_regex_engine_debug_kwarg_compiles_without_error():
     compiled = RegexBuilder().string("hi").to_regex(engine="regex", debug=True)
     assert compiled.source == "hi"
+
+
+def test_regex_engine_debug_flag_is_forwarded_to_regex_module_bitmask(monkeypatch):
+    captured_flags: list[int] = []
+    original_compile = regex_module.compile
+
+    def capturing_compile(pattern, flags=0):
+        captured_flags.append(flags)
+        return original_compile(pattern)
+
+    monkeypatch.setattr(regex_module, "compile", capturing_compile)
+    RegexBuilder().string("hi").to_regex(engine="regex", debug=True)
+    assert captured_flags
+    assert captured_flags[0] & regex_module.DEBUG == regex_module.DEBUG
diff --git a/tests/builder/lookbehind.test.py b/tests/builder/lookbehind.test.py
index f16a6cc..5e101f3 100644
--- a/tests/builder/lookbehind.test.py
+++ b/tests/builder/lookbehind.test.py
@@ -1,5 +1,7 @@
 """Tests for lookbehind width behavior across the ``re`` and ``regex`` engines."""
 
+import re
+
 import pytest
 
 from edify import RegexBuilder
@@ -42,14 +44,10 @@ def test_fixed_width_lookbehind_still_works_under_re():
 def test_variable_width_lookbehind_error_chains_the_underlying_pattern_error():
     with pytest.raises(VariableWidthLookbehindNotSupportedError) as excinfo:
         _variable_width_lookbehind_builder().to_regex(engine="re")
-    import re
-
     assert isinstance(excinfo.value.__cause__, re.error)
 
 
 def test_re_engine_still_surfaces_other_pattern_errors_unchanged(monkeypatch):
-    import re
-
     def raise_other_error(_pattern, flags=0):
         raise re.error("some other syntax error")
 
diff --git a/tests/builder/insertion_order.test.py b/tests/builder/ordering.test.py
index 4feae65..4feae65 100644
--- a/tests/builder/insertion_order.test.py
+++ b/tests/builder/ordering.test.py
diff --git a/tests/builder/passthrough.test.py b/tests/builder/passthrough.test.py
index a2e77b5..e149052 100644
--- a/tests/builder/passthrough.test.py
+++ b/tests/builder/passthrough.test.py
@@ -1,6 +1,9 @@
 """Tests for the pass-through branches when subexpression anchors merge without conflict."""
 
+import pytest
+
 from edify import RegexBuilder
+from edify.errors.structure import CannotCallSubexpressionError
 
 
 def test_start_of_input_merges_into_parent_without_existing_start():
@@ -18,10 +21,6 @@ def test_end_of_input_merges_into_parent_without_existing_end():
 
 
 def test_subexpression_called_with_unfinished_expression_raises():
-    import pytest
-
-    from edify.errors.structure import CannotCallSubexpressionError
-
     unfinished_sub = RegexBuilder().capture().digit()
     parent = RegexBuilder()
     with pytest.raises(CannotCallSubexpressionError):
diff --git a/tests/builder/validation.test.py b/tests/builder/validation.test.py
index 53128c5..a1b57d7 100644
--- a/tests/builder/validation.test.py
+++ b/tests/builder/validation.test.py
@@ -14,6 +14,7 @@ from edify.errors.anchors import (
 )
 from edify.errors.input import (
     MustBeAStringError,
+    MustBeInstanceError,
     MustBeIntegerGreaterThanZeroError,
     MustBeLessThanError,
     MustBeOneCharacterError,
@@ -22,6 +23,7 @@ from edify.errors.input import (
     MustHaveASmallerValueError,
 )
 from edify.errors.naming import NamedGroupDoesNotExistError
+from edify.errors.structure import CannotCallSubexpressionError
 
 
 def test_start_of_input_twice_raises():
@@ -140,23 +142,17 @@ def test_named_back_reference_undeclared_raises():
 
 
 def test_to_regex_string_with_open_frame_raises():
-    from edify.errors.structure import CannotCallSubexpressionError
-
     unfinished = RegexBuilder().capture().digit()
     with pytest.raises(CannotCallSubexpressionError):
         unfinished.to_regex_string()
 
 
 def test_to_regex_with_open_frame_raises():
-    from edify.errors.structure import CannotCallSubexpressionError
-
     unfinished = RegexBuilder().capture().digit()
     with pytest.raises(CannotCallSubexpressionError):
         unfinished.to_regex()
 
 
 def test_subexpression_non_builder_raises():
-    from edify.errors.input import MustBeInstanceError
-
     with pytest.raises(MustBeInstanceError):
         RegexBuilder().subexpression("not a builder")
diff --git a/tests/compile/redos.test.py b/tests/compile/redos.test.py
index c4e1ba9..91786bd 100644
--- a/tests/compile/redos.test.py
+++ b/tests/compile/redos.test.py
@@ -44,25 +44,29 @@ def test_warning_message_names_both_quantifiers():
 def test_bounded_quantifier_does_not_trigger_the_warning(recwarn):
     builder = RegexBuilder().exactly(3).group().exactly(2).digit().end()
     builder.to_regex()
-    assert not any(isinstance(warning.message, ReDoSWarning) for warning in recwarn)
+    is_redos_flags = [isinstance(warning.message, ReDoSWarning) for warning in recwarn]
+    assert not any(is_redos_flags)
 
 
 def test_grouped_quantifier_over_a_composite_group_does_not_trigger(recwarn):
     builder = RegexBuilder().one_or_more().group().digit().letter().end()
     builder.to_regex()
-    assert not any(isinstance(warning.message, ReDoSWarning) for warning in recwarn)
+    is_redos_flags = [isinstance(warning.message, ReDoSWarning) for warning in recwarn]
+    assert not any(is_redos_flags)
 
 
 def test_grouped_quantifier_over_a_single_non_quantifier_child_does_not_trigger(recwarn):
     builder = RegexBuilder().one_or_more().group().digit().end()
     builder.to_regex()
-    assert not any(isinstance(warning.message, ReDoSWarning) for warning in recwarn)
+    is_redos_flags = [isinstance(warning.message, ReDoSWarning) for warning in recwarn]
+    assert not any(is_redos_flags)
 
 
 def test_sequential_unbounded_quantifiers_do_not_trigger_the_warning(recwarn):
     builder = RegexBuilder().one_or_more().digit().one_or_more().letter()
     builder.to_regex()
-    assert not any(isinstance(warning.message, ReDoSWarning) for warning in recwarn)
+    is_redos_flags = [isinstance(warning.message, ReDoSWarning) for warning in recwarn]
+    assert not any(is_redos_flags)
 
 
 def test_warning_only_fires_once_per_construct_within_a_single_terminal_call():
diff --git a/tests/discipline/coverage.test.py b/tests/discipline/coverage.test.py
index a534424..cc90db1 100644
--- a/tests/discipline/coverage.test.py
+++ b/tests/discipline/coverage.test.py
@@ -36,7 +36,8 @@ def test_edify_package_tree_contains_measurable_python_source():
     assert python_files, (
         "no Python files found under edify/ — the coverage source directory is empty."
     )
-    total_source_bytes = sum(python_file.stat().st_size for python_file in python_files)
+    file_sizes = [python_file.stat().st_size for python_file in python_files]
+    total_source_bytes = sum(file_sizes)
     assert total_source_bytes > 0, (
         "every file under edify/ is empty — coverage would measure nothing across the tree."
     )
diff --git a/tests/discipline/orphans.test.py b/tests/discipline/orphans.test.py
index a0a3150..6596680 100644
--- a/tests/discipline/orphans.test.py
+++ b/tests/discipline/orphans.test.py
@@ -5,7 +5,7 @@ Runs three checks, one per snapshot root:
 * ``tests/snapshots/library/<name>.regex`` — must correspond to a
   :class:`edify.Pattern` exported from :mod:`edify.library`.
 * ``tests/snapshots/fixtures/<name>.regex`` — must correspond to a fixture
-  registered in ``tests/fixtures/edge_cases.test.py``.
+  registered in ``tests/fixtures/fixtures.test.py``.
 * ``tests/snapshots/docs/<file>/<block>.regex`` — must correspond to a
   ``.. code-block:: python`` block at that line in that RST.
 
@@ -44,7 +44,7 @@ def test_every_fixture_snapshot_has_a_registered_fixture():
     orphaned_snapshots = snapshot_stems - fixture_names
     assert orphaned_snapshots == set(), (
         f"fixture snapshot files without a registered fixture in "
-        f"tests/fixtures/edge_cases.test.py: {sorted(orphaned_snapshots)}"
+        f"tests/fixtures/fixtures.test.py: {sorted(orphaned_snapshots)}"
     )
 
 
@@ -70,7 +70,7 @@ def _library_pattern_names() -> set[str]:
 
 
 def _registered_fixture_names() -> set[str]:
-    fixture_source = (_REPO_ROOT / "tests" / "fixtures" / "edge_cases.test.py").read_text()
+    fixture_source = (_REPO_ROOT / "tests" / "fixtures" / "fixtures.test.py").read_text()
     return _fixture_names_from_source(fixture_source)
 
 
diff --git a/tests/docs/snapshots.test.py b/tests/docs/snapshots.test.py
index 5b97ddb..b1c223b 100644
--- a/tests/docs/snapshots.test.py
+++ b/tests/docs/snapshots.test.py
@@ -72,7 +72,7 @@ def _discover_blocks():
             yield rst_path, block_start, block_source, relative_stem
 
 
-def _snapshot_bodies_for_block(namespace: dict, pre_exec_names: frozenset[str]) -> str:
+def _snapshot_bodies_for_block(namespace, pre_exec_names: frozenset[str]) -> str:
     interesting_pairs = []
     for identifier, value in namespace.items():
         if identifier in pre_exec_names:
@@ -133,8 +133,8 @@ def test_doc_code_block_produces_the_snapshotted_regex(
     assert_snapshot(rendered, snapshot_path)
 
 
-def _prepared_exec_namespace() -> dict[str, object]:
-    namespace: dict[str, object] = {"edify": edify, "Pattern": Pattern, "Regex": Regex, "re": re}
+def _prepared_exec_namespace():
+    namespace = {"edify": edify, "Pattern": Pattern, "Regex": Regex, "re": re}
     for edify_export in dir(edify):
         if edify_export.startswith("_"):
             continue
diff --git a/tests/errors/frames.test.py b/tests/errors/frames.test.py
index b4077ba..0ae0c1b 100644
--- a/tests/errors/frames.test.py
+++ b/tests/errors/frames.test.py
@@ -3,6 +3,7 @@
 import pytest
 
 from edify import RegexBuilder
+from edify.errors.quantifier import DanglingQuantifierError
 from edify.errors.structure import CannotCallSubexpressionError
 
 
@@ -53,8 +54,6 @@ def test_subexpression_lists_open_frames_from_the_argument_not_the_receiver():
 
 
 def test_dangling_quantifier_reports_the_specific_pending_quantifier_name():
-    from edify.errors.quantifier import DanglingQuantifierError
-
     with pytest.raises(DanglingQuantifierError) as excinfo:
         RegexBuilder().exactly(3).to_regex_string()
     text = str(excinfo.value)
@@ -62,8 +61,6 @@ def test_dangling_quantifier_reports_the_specific_pending_quantifier_name():
 
 
 def test_dangling_quantifier_falls_back_to_generic_summary_when_name_unknown():
-    from edify.errors.quantifier import DanglingQuantifierError
-
     error = DanglingQuantifierError()
     text = str(error)
     assert "dangling quantifier" in text
diff --git a/tests/errors/errors.test.py b/tests/errors/generic.test.py
index 82eb8fe..82eb8fe 100644
--- a/tests/errors/errors.test.py
+++ b/tests/errors/generic.test.py
diff --git a/tests/fixtures/edge_cases.test.py b/tests/fixtures/fixtures.test.py
index 18200b6..24b5a6f 100644
--- a/tests/fixtures/edge_cases.test.py
+++ b/tests/fixtures/fixtures.test.py
@@ -12,6 +12,7 @@ from pathlib import Path
 import pytest
 
 from edify import Pattern, RegexBuilder
+from edify.compile.redos import ReDoSWarning
 from edify.testing import assert_snapshot
 
 _SNAPSHOT_ROOT = Path(__file__).parent.parent / "snapshots" / "fixtures"
@@ -124,7 +125,5 @@ def test_edge_case_fixture_emits_the_snapshotted_regex(fixture_name, builder_fac
 
 
 def test_nested_unbounded_quantifier_fixture_raises_the_redos_warning():
-    from edify.compile.redos import ReDoSWarning
-
     with pytest.warns(ReDoSWarning):
         _nested_unbounded_quantifier_redos().to_regex()
diff --git a/tests/integrations/django.test.py b/tests/integrations/django.test.py
new file mode 100644
index 0000000..871ceed
--- /dev/null
+++ b/tests/integrations/django.test.py
@@ -0,0 +1,38 @@
+"""Tests for :mod:`edify.integrations.django`."""
+
+import pytest
+from django.core.exceptions import ValidationError
+from django.core.validators import RegexValidator
+
+from edify import Pattern
+from edify.integrations.django import pattern_validator
+
+_DIGITS_PATTERN = Pattern().start_of_input().one_or_more().digit().end_of_input()
+
+
+def test_pattern_validator_returns_a_regex_validator_pinned_to_the_pattern_source():
+    validator = pattern_validator(_DIGITS_PATTERN)
+    assert isinstance(validator, RegexValidator)
+    assert validator.regex.pattern == _DIGITS_PATTERN.to_regex_string()
+
+
+def test_pattern_validator_accepts_matching_input_without_raising():
+    validator = pattern_validator(_DIGITS_PATTERN)
+    validator("42")
+
+
+def test_pattern_validator_raises_django_validation_error_on_non_matching_input():
+    validator = pattern_validator(_DIGITS_PATTERN)
+    with pytest.raises(ValidationError):
+        validator("abc")
+
+
+def test_pattern_validator_carries_the_default_error_message_reproducing_the_regex():
+    validator = pattern_validator(_DIGITS_PATTERN)
+    assert _DIGITS_PATTERN.to_regex_string() in validator.message
+
+
+def test_pattern_validator_accepts_an_override_message_and_code():
+    validator = pattern_validator(_DIGITS_PATTERN, message="digits only", code="bad_digits")
+    assert validator.message == "digits only"
+    assert validator.code == "bad_digits"
diff --git a/tests/integrations/fastapi.test.py b/tests/integrations/fastapi.test.py
new file mode 100644
index 0000000..f2dd45a
--- /dev/null
+++ b/tests/integrations/fastapi.test.py
@@ -0,0 +1,43 @@
+"""Tests for :mod:`edify.integrations.fastapi`."""
+
+import fastapi.params
+
+from edify import Pattern
+from edify.integrations.fastapi import pattern_path, pattern_query
+
+_UUID_PATTERN = (
+    Pattern()
+    .start_of_input()
+    .exactly(8)
+    .any_of()
+    .range("0", "9")
+    .range("a", "f")
+    .end()
+    .end_of_input()
+)
+
+
+def test_pattern_query_returns_a_fastapi_query_pinned_to_the_pattern_regex():
+    query_default = pattern_query(_UUID_PATTERN)
+    assert isinstance(query_default, fastapi.params.Query)
+
+
+def test_pattern_query_forwards_the_description_to_fastapi_query():
+    query_with_description = pattern_query(_UUID_PATTERN, description="prefix")
+    assert query_with_description.description == "prefix"
+
+
+def test_pattern_query_default_differs_from_an_explicit_default():
+    without_default = pattern_query(_UUID_PATTERN)
+    with_default = pattern_query(_UUID_PATTERN, default="deadbeef")
+    assert without_default.default != with_default.default
+
+
+def test_pattern_path_returns_a_fastapi_path_pinned_to_the_pattern_regex():
+    path_default = pattern_path(_UUID_PATTERN)
+    assert isinstance(path_default, fastapi.params.Path)
+
+
+def test_pattern_path_forwards_the_description_to_fastapi_path():
+    path_with_description = pattern_path(_UUID_PATTERN, description="prefix")
+    assert path_with_description.description == "prefix"
diff --git a/tests/integrations/pydantic.test.py b/tests/integrations/pydantic.test.py
new file mode 100644
index 0000000..a3c3164
--- /dev/null
+++ b/tests/integrations/pydantic.test.py
@@ -0,0 +1,46 @@
+"""Tests for :mod:`edify.integrations.pydantic`."""
+
+from typing import Annotated
+
+import pytest
+from pydantic import AfterValidator, BaseModel, ValidationError
+
+from edify import Pattern
+from edify.errors.integration import PatternDidNotMatchError
+from edify.integrations.pydantic import pattern_validator
+
+_DIGITS_PATTERN = Pattern().start_of_input().one_or_more().digit().end_of_input()
+
+
+def test_pattern_validator_accepts_a_matching_string_and_returns_it_unchanged():
+    validate = pattern_validator(_DIGITS_PATTERN)
+    assert validate("42") == "42"
+
+
+def test_pattern_validator_raises_pattern_did_not_match_on_non_matching_input():
+    validate = pattern_validator(_DIGITS_PATTERN)
+    with pytest.raises(PatternDidNotMatchError, match="does not match"):
+        validate("abc")
+
+
+def test_pattern_did_not_match_error_is_a_value_error_subclass():
+    assert issubclass(PatternDidNotMatchError, ValueError)
+
+
+def test_pattern_did_not_match_error_carries_source_and_value():
+    validate = pattern_validator(_DIGITS_PATTERN)
+    with pytest.raises(PatternDidNotMatchError) as excinfo:
+        validate("abc")
+    assert excinfo.value.source == _DIGITS_PATTERN.to_regex_string()
+    assert excinfo.value.value == "abc"
+
+
+def test_pattern_validator_composes_into_pydantic_model_field_via_annotated_after_validator():
+    validator_callable = pattern_validator(_DIGITS_PATTERN)
+
+    class Payload(BaseModel):
+        value: Annotated[str, AfterValidator(validator_callable)]
+
+    assert Payload(value="42").value == "42"
+    with pytest.raises(ValidationError):
+        Payload(value="abc")
diff --git a/tests/property/emitted.test.py b/tests/property/emitted.test.py
index 6c66e18..2ece703 100644
--- a/tests/property/emitted.test.py
+++ b/tests/property/emitted.test.py
@@ -20,7 +20,8 @@ def test_concatenated_string_calls_emit_the_re_escape_concatenation(literal_segm
     for literal in literal_segments:
         builder = builder.string(literal)
     emitted = builder.to_regex_string()
-    reference = "".join(re.escape(literal) for literal in literal_segments)
+    escaped_segments = [re.escape(literal) for literal in literal_segments]
+    reference = "".join(escaped_segments)
     assert emitted == reference
 
 
diff --git a/tests/result/match.test.py b/tests/result/match.test.py
index b7f7514..9529467 100644
--- a/tests/result/match.test.py
+++ b/tests/result/match.test.py
@@ -70,7 +70,8 @@ def test_match_repr_contains_span_and_text():
 def test_finditer_yields_wrapped_matches():
     pattern = _username_pattern().to_regex()
     hits = list(pattern.finditer("hi @heidi and @ivan"))
-    assert all(isinstance(item, Match) for item in hits)
+    types_are_match = [isinstance(item, Match) for item in hits]
+    assert all(types_are_match)
     assert [item.captures.username for item in hits] == ["heidi", "ivan"]
 
 
@@ -115,3 +116,86 @@ def test_fullmatch_returns_wrapped_match_when_full_input_matches():
 def test_fullmatch_returns_none_when_input_is_only_partial():
     pattern = _username_pattern().to_regex()
     assert pattern.fullmatch("hi @leo") is None
+
+
+def test_match_forwarded_group_accepts_named_and_positional_selectors():
+    result = _username_pattern().search("hi @meg")
+    assert result is not None
+    assert result.group() == "@meg"
+    assert result.group(0) == "@meg"
+    assert result.group(1) == "meg"
+
+
+def test_match_forwarded_groups_returns_the_positional_group_tuple():
+    result = _username_pattern().search("hi @nora")
+    assert result is not None
+    assert result.groups() == ("nora",)
+
+
+def test_match_forwarded_groups_uses_default_for_unmatched_groups():
+    optional_capture = (
+        RegexBuilder()
+        .start_of_input()
+        .capture()
+        .string("hi")
+        .end()
+        .optional()
+        .capture()
+        .string("bye")
+        .end()
+        .end_of_input()
+    )
+    result = optional_capture.match("hi")
+    assert result is not None
+    assert result.groups(default="missing") == ("hi", "missing")
+
+
+def test_match_forwarded_groupdict_defaults_to_none_for_absent_named_groups():
+    result = _username_pattern().search("hi @olive")
+    assert result is not None
+    assert result.groupdict() == {"username": "olive"}
+
+
+def test_match_forwarded_groupdict_accepts_a_default_string():
+    optional_named = (
+        RegexBuilder()
+        .start_of_input()
+        .string("hi")
+        .optional()
+        .named_capture("nick")
+        .one_or_more()
+        .letter()
+        .end()
+        .end_of_input()
+    )
+    result = optional_named.match("hi")
+    assert result is not None
+    assert result.groupdict(default="none") == {"nick": "none"}
+
+
+def test_match_forwarded_start_end_span_and_expand_return_the_expected_values():
+    result = _username_pattern().search("hi @pete")
+    assert result is not None
+    assert result.start() == 3
+    assert result.end() == 8
+    assert result.span() == (3, 8)
+    assert result.expand(r"\g<username>") == "pete"
+
+
+def test_match_forwarded_re_pos_endpos_string_lastindex_lastgroup_reflect_the_compiled_pattern():
+    pattern = _username_pattern().to_regex()
+    result = pattern.search("hi @quinn there")
+    assert result is not None
+    assert result.re is pattern.compiled
+    assert result.string == "hi @quinn there"
+    assert result.pos == 0
+    assert result.endpos > 0
+    assert result.lastindex == 1
+    assert result.lastgroup == "username"
+
+
+def test_match_fallback_getattr_raises_attribute_error_on_unknown_name():
+    result = _username_pattern().search("hi @rita")
+    assert result is not None
+    with pytest.raises(AttributeError, match="no attribute"):
+        _ = result.nonexistent
diff --git a/tests/serialize/errors.test.py b/tests/serialize/errors.test.py
index 68adaac..1b7dd39 100644
--- a/tests/serialize/errors.test.py
+++ b/tests/serialize/errors.test.py
@@ -8,6 +8,7 @@ from edify import Pattern
 from edify.errors.serialize import (
     IncompatibleSchemaVersionError,
     MissingSchemaKeyError,
+    NonObjectJSONPayloadError,
     UnknownElementKindError,
 )
 
@@ -51,11 +52,17 @@ def test_bad_json_string_raises_decode_error():
         Pattern.from_json("{not-valid-json}")
 
 
-def test_non_object_json_payload_raises_type_error():
-    with pytest.raises(TypeError, match="canonical JSON payload must be an object"):
+def test_non_object_json_payload_raises_non_object_json_payload_error():
+    with pytest.raises(NonObjectJSONPayloadError, match="canonical JSON payload must be an object"):
         Pattern.from_json("[1, 2, 3]")
 
 
+def test_incompatible_schema_version_with_composite_value_stringifies_it():
+    document = {"edify": [1, 2, 3], "pattern": {"kind": "root", "children": []}}
+    with pytest.raises(IncompatibleSchemaVersionError):
+        Pattern.from_dict(document)
+
+
 def test_pattern_key_not_a_root_element_produces_empty_pattern():
     document = {"edify": 0, "pattern": {"kind": "digit"}}
     restored = Pattern.from_dict(document)
diff --git a/tests/testing/snapshots.test.py b/tests/testing/snapshots.test.py
index c2d8676..c71b204 100644
--- a/tests/testing/snapshots.test.py
+++ b/tests/testing/snapshots.test.py
@@ -4,6 +4,7 @@ from pathlib import Path
 
 import pytest
 
+from edify import testing
 from edify.testing import SnapshotMismatchError, SnapshotMissingError, assert_snapshot
 
 _UPDATE_ENVIRONMENT_VARIABLE = "EDIFY_UPDATE_SNAPSHOTS"
@@ -83,8 +84,6 @@ def test_snapshot_mismatch_error_is_an_assertion_error_subclass():
 
 
 def test_snapshot_helper_is_reachable_via_edify_testing_namespace(tmp_path):
-    from edify import testing
-
     snapshot_path: Path = tmp_path / "namespace.snapshot"
     snapshot_path.write_text("ok\n")
     testing.assert_snapshot("ok\n", snapshot_path)
diff --git a/uv.lock b/uv.lock
index a3a6a98..8f16d7a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -16,6 +16,46 @@ wheels = [
 ]
 
 [[package]]
+name = "annotated-doc"
+version = "0.0.4"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/57/ba/046ceea27344560984e26a590f90bc7f4a75b06701f653222458922b558c/annotated_doc-0.0.4.tar.gz", hash = "sha256:fbcda96e87e9c92ad167c2e53839e57503ecfda18804ea28102353485033faa4", size = 7288, upload-time = "2025-11-10T22:07:42.062Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1e/d3/26bf1008eb3d2daa8ef4cacc7f3bfdc11818d111f7e2d0201bc6e3b49d45/annotated_doc-0.0.4-py3-none-any.whl", hash = "sha256:571ac1dc6991c450b25a9c2d84a3705e2ae7a53467b5d111c24fa8baabbed320", size = 5303, upload-time = "2025-11-10T22:07:40.673Z" },
+]
+
+[[package]]
+name = "annotated-types"
+version = "0.7.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ee/67/531ea369ba64dcff5ec9c3402f9f51bf748cec26dde048a2f973a4eea7f5/annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89", size = 16081, upload-time = "2024-05-20T21:33:25.928Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/78/b6/6307fbef88d9b5ee7421e68d78a9f162e0da4900bc5f5793f6d3d0e34fb8/annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53", size = 13643, upload-time = "2024-05-20T21:33:24.1Z" },
+]
+
+[[package]]
+name = "anyio"
+version = "4.14.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "idna" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/61/cc/a381afa6efea9f496eff839d4a6a1aed3bfafc7b3ab4b0d1b243a12573dd/anyio-4.14.2.tar.gz", hash = "sha256:cfa139f3ed1a23ee8f88a145ddb5ac7605b8bbfd8592baacd7ce3d8bb4313c7f", size = 260176, upload-time = "2026-07-12T20:29:07.082Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/da/35/f2287558c17e29fafc8ef3daf819bb9834061cfa43bff8014f7df7f63bdc/anyio-4.14.2-py3-none-any.whl", hash = "sha256:9f505dda5ac9f0c8309b5e8bd445a8c2bf7246f3ce950121e45ea15bc41d1494", size = 125813, upload-time = "2026-07-12T20:29:05.763Z" },
+]
+
+[[package]]
+name = "asgiref"
+version = "3.12.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/26/3b59f2bdae5f640389becb1f673cded775287f5fc4f816309d9ca9a3f93d/asgiref-3.12.1.tar.gz", hash = "sha256:59dcb51c272ad209d59bed5708a64a333083e86017d7fcdd67498eeab7784340", size = 42378, upload-time = "2026-07-14T09:56:18.087Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c0/1b/54f4ad77cd8a584fa70746c47df988e002cf1ee1eba43364d46f87803647/asgiref-3.12.1-py3-none-any.whl", hash = "sha256:fe386d1c2bff7259ea95929266d12a8cf9a8b5a1c2598402967d8792e7a7c094", size = 25478, upload-time = "2026-07-14T09:56:16.926Z" },
+]
+
+[[package]]
 name = "babel"
 version = "2.18.0"
 source = { registry = "https://pypi.org/simple" }
@@ -221,6 +261,40 @@ toml = [
 ]
 
 [[package]]
+name = "django"
+version = "5.2.16"
+source = { registry = "https://pypi.org/simple" }
+resolution-markers = [
+    "python_full_version < '3.12'",
+]
+dependencies = [
+    { name = "asgiref", marker = "python_full_version < '3.12'" },
+    { name = "sqlparse", marker = "python_full_version < '3.12'" },
+    { name = "tzdata", marker = "python_full_version < '3.12' and sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/a9/26/889449d521ae508b26de715954faecd8bcf3f740affb81b2d146a83b42a5/django-5.2.16.tar.gz", hash = "sha256:59ea02020c3136fce14bef0bbece21a10a4febef5eed1c51c22ae468efa22200", size = 10890894, upload-time = "2026-07-07T13:52:17.005Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/4e/13/1e5e3e4c15dcecb04281b3cb2a46a4670e1cef131068e202f6040df19224/django-5.2.16-py3-none-any.whl", hash = "sha256:04f354bf9d807a86ad1a8392fe3808d362358a8eafc322848e0e43e59b24371d", size = 8311943, upload-time = "2026-07-07T13:52:11.223Z" },
+]
+
+[[package]]
+name = "django"
+version = "6.0.7"
+source = { registry = "https://pypi.org/simple" }
+resolution-markers = [
+    "python_full_version >= '3.12'",
+]
+dependencies = [
+    { name = "asgiref", marker = "python_full_version >= '3.12'" },
+    { name = "sqlparse", marker = "python_full_version >= '3.12'" },
+    { name = "tzdata", marker = "python_full_version >= '3.12' and sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/89/55/664f24ff81c9ea19cb7dfc851afeae1f3c2390c7aee01d4ded68b5c1580d/django-6.0.7.tar.gz", hash = "sha256:2998503fc083124fb58037084bfa00de323c7c743f05f1b4284e77bff0ab8890", size = 10921299, upload-time = "2026-07-07T13:51:26.485Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ba/ec/1ce5334b6a2c52ce619c23a0be8d366a57a0e080ebb2d88266e5c849157c/django-6.0.7-py3-none-any.whl", hash = "sha256:a037427c2288443a8c02a1b02295a31c239663aa682bc50b1976afb7cf6a769e", size = 8373344, upload-time = "2026-07-07T13:51:20.007Z" },
+]
+
+[[package]]
 name = "docutils"
 version = "0.22.4"
 source = { registry = "https://pypi.org/simple" }
@@ -234,9 +308,27 @@ name = "edify"
 source = { editable = "." }
 
 [package.optional-dependencies]
+all = [
+    { name = "django", version = "5.2.16", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.12'" },
+    { name = "django", version = "6.0.7", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.12'" },
+    { name = "fastapi" },
+    { name = "graphviz" },
+    { name = "pydantic" },
+    { name = "regex" },
+]
+django = [
+    { name = "django", version = "5.2.16", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.12'" },
+    { name = "django", version = "6.0.7", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.12'" },
+]
+fastapi = [
+    { name = "fastapi" },
+]
 graphviz = [
     { name = "graphviz" },
 ]
+pydantic = [
+    { name = "pydantic" },
+]
 regex = [
     { name = "regex" },
 ]
@@ -246,9 +338,13 @@ bench = [
     { name = "pytest-benchmark" },
 ]
 dev = [
+    { name = "django", version = "5.2.16", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.12'" },
+    { name = "django", version = "6.0.7", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.12'" },
+    { name = "fastapi" },
     { name = "graphviz" },
     { name = "hypothesis" },
     { name = "mypy" },
+    { name = "pydantic" },
     { name = "pyright" },
     { name = "pytest" },
     { name = "pytest-cov" },
@@ -263,17 +359,28 @@ docs = [
 
 [package.metadata]
 requires-dist = [
+    { name = "django", marker = "extra == 'all'", specifier = ">=4.2" },
+    { name = "django", marker = "extra == 'django'", specifier = ">=4.2" },
+    { name = "fastapi", marker = "extra == 'all'", specifier = ">=0.100" },
+    { name = "fastapi", marker = "extra == 'fastapi'", specifier = ">=0.100" },
+    { name = "graphviz", marker = "extra == 'all'", specifier = ">=0.20" },
     { name = "graphviz", marker = "extra == 'graphviz'", specifier = ">=0.20" },
+    { name = "pydantic", marker = "extra == 'all'", specifier = ">=2.0" },
+    { name = "pydantic", marker = "extra == 'pydantic'", specifier = ">=2.0" },
+    { name = "regex", marker = "extra == 'all'", specifier = ">=2024.11.6" },
     { name = "regex", marker = "extra == 'regex'", specifier = ">=2024.11.6" },
 ]
-provides-extras = ["graphviz", "regex"]
+provides-extras = ["all", "django", "fastapi", "graphviz", "pydantic", "regex"]
 
 [package.metadata.requires-dev]
 bench = [{ name = "pytest-benchmark", specifier = ">=4.0" }]
 dev = [
+    { name = "django", specifier = ">=4.2" },
+    { name = "fastapi", specifier = ">=0.100" },
     { name = "graphviz", specifier = ">=0.20" },
     { name = "hypothesis", specifier = ">=6.100" },
     { name = "mypy", specifier = "==1.13.0" },
+    { name = "pydantic", specifier = ">=2.0" },
     { name = "pyright", specifier = "==1.1.389" },
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