re2

Author: Steve Ayers

protovalidate/internal/extra_func.py

@@ -13,18 +13,18 @@
 # limitations under the License.
 
 import math
-import re
 import typing
 from urllib import parse as urlparse
 
 import celpy
+import re2
 from celpy import celtypes
 
 from protovalidate.internal import string_format
 from protovalidate.internal.rules import MessageType, field_to_cel
 
 # See https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address
-_email_regex = re.compile(
+_email_regex = re2.compile(
     r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$"
 )
 
@@ -1553,13 +1553,22 @@ def __peek(self, char: str) -> bool:
         return self._index < len(self._string) and self._string[self._index] == char
 
 
+def matches(text: str, pattern: str) -> celpy.Result:
+    try:
+        m = re2.search(pattern, text)
+    except re2.error as ex:
+        return celpy.CELEvalError("match error", ex.__class__, ex.args)
+    return celtypes.BoolType(m is not None)
+
+
 def make_extra_funcs(locale: str) -> dict[str, celpy.CELFunction]:
     # TODO(#257): Fix types and add tests for StringFormat.
     # For now, ignoring the type.
     string_fmt = string_format.StringFormat(locale)  # type: ignore
     return {
         # Missing standard functions
         "format": string_fmt.format,
+        "matches": matches,
         # protovalidate specific functions
         "getField": cel_get_field,
         "isNan": cel_is_nan,

tests/matches_test.py

@@ -0,0 +1,13 @@
+# Copyright 2023-2025 Buf Technologies, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.