Allowed to pass an instance on RegexEnum to RegexValidator directly

Author: LeanderCS

README.md

@@ -88,7 +88,7 @@ class UpdateZipcodeInputFilter(InputFilter):
         filters=[StringTrimFilter()],
         validators=[
             RegexValidator(
-                RegexEnum.POSTAL_CODE.value,
+                RegexEnum.POSTAL_CODE,
                 'The zipcode is not in the correct format.'
             )
         ]

docs/source/changelog.rst

@@ -11,6 +11,8 @@ Changed
 ^^^^^^^
 - Added deprecated warnings to old methods to ``add``, ``add_condition``, ``add_global_filter`` and
   ``add_global_validator`` to prepare for a later removal.
+- Allowed to pass an instance on ``RegexEnum`` to ``RegexValidator`` directly, without needing to
+  converting it to an string.
 
 
 [0.7.2] - 2025-09-28

docs/source/guides/frontend_validation.rst

@@ -28,7 +28,7 @@ Example implementation
             filters=[StringTrimFilter()],
             validators=[
                 RegexValidator(
-                    pattern=RegexEnum.POSTAL_CODE.value,
+                    pattern=RegexEnum.POSTAL_CODE,
                     error_message='The zipcode is not in the correct format.'
                 )
             ]

docs/source/index.rst

@@ -66,7 +66,7 @@ Definition
             filters=[StringTrimFilter()],
             validators=[
                 RegexValidator(
-                    RegexEnum.POSTAL_CODE.value,
+                    RegexEnum.POSTAL_CODE,
                     'The zipcode is not in the correct format.'
                 )
             ]

flask_inputfilter/input_filter.py

@@ -5,8 +5,8 @@
 import json
 import logging
 import sys
-from typing import TYPE_CHECKING, Any, Optional, Type, TypeVar, Union
 import warnings
+from typing import TYPE_CHECKING, Any, Optional, Type, TypeVar, Union
 
 from flask import Response, g, request
 

flask_inputfilter/validators/regex_validator.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
 import re
-from typing import Optional
+from typing import Optional, Union
 
+from flask_inputfilter.enums import RegexEnum
 from flask_inputfilter.exceptions import ValidationError
 from flask_inputfilter.models import BaseValidator
 
@@ -14,7 +15,7 @@ class RegexValidator(BaseValidator):
 
     **Parameters:**
 
-    - **pattern** (*str*): The regular expression pattern the
+    - **pattern** (*str | RegexEnum*): The regular expression pattern the
       input must match.
     - **error_message** (*Optional[str]*): Custom error message if
       the input does not match the pattern.
@@ -38,10 +39,12 @@ class EmailInputFilter(InputFilter):
 
     def __init__(
         self,
-        pattern: str,
+        pattern: Union[str, RegexEnum],
         error_message: Optional[str] = None,
     ) -> None:
-        self.pattern = pattern
+        self.pattern = (
+            pattern.value if isinstance(pattern, RegexEnum) else pattern
+        )
         self.error_message = error_message
 
     def validate(self, value: str) -> None:

tests/validators/test_regex_validator.py

@@ -22,6 +22,22 @@ def test_invalid_regex(self):
         with self.assertRaises(ValidationError):
             self.input_filter.validate_data({"email": "invalid_email"})
 
+    def test_valid_regex_using_enum(self):
+        self.input_filter.add(
+            "email", validators=[RegexValidator(RegexEnum.EMAIL)]
+        )
+        validated_data = self.input_filter.validate_data(
+            {"email": "[email protected]"}
+        )
+        self.assertEqual(validated_data["email"], "[email protected]")
+
+    def test_invalid_regex_using_enum(self):
+        self.input_filter.add(
+            "email", validators=[RegexValidator(RegexEnum.EMAIL)]
+        )
+        with self.assertRaises(ValidationError):
+            self.input_filter.validate_data({"email": "invalid_email"})
+
     def test_custom_error_message(self):
         self.input_filter.add(
             "email",