Check for [/\\] in OptionalSensibleRegexAt* as well

pre_commit/clientlib.py

@@ -149,6 +149,12 @@ def check(self, dct: Dict[str, Any]) -> None:
                 fr"hook {dct.get('id')!r} to forward slashes, so you can use "
                 fr'/ instead of [\/]',
             )
+        if r'[/\\]' in dct.get(self.key, ''):
+            logger.warning(
+                fr'pre-commit normalizes the slashes in {self.key!r} field in '
+                fr"hook {dct.get('id')!r} to forward slashes, so you can use "
+                fr'/ instead of [/\\]',
+            )
 
 
 class OptionalSensibleRegexAtTop(cfgv.OptionalNoDefault):
@@ -166,6 +172,12 @@ def check(self, dct: Dict[str, Any]) -> None:
                 fr'{self.key!r} field to forward slashes, so you can use / '
                 fr'instead of [\/]',
             )
+        if r'[/\\]' in dct.get(self.key, ''):
+            logger.warning(
+                fr'pre-commit normalizes the slashes in the top-level '
+                fr'{self.key!r} field to forward slashes, so you can use / '
+                fr'instead of [/\\]',
+            )
 
 
 class MigrateShaToRev:

tests/clientlib_test.py

@@ -260,6 +260,11 @@ def test_warn_mutable_rev_conditional():
             r"pre-commit normalizes the slashes in 'files' field in hook "
             r"'flake8' to forward slashes, so you can use / instead of [\/]",
         ),
+        (
+            r'dir[/\\].*\.py',
+            r"pre-commit normalizes the slashes in 'files' field in hook "
+            r"'flake8' to forward slashes, so you can use / instead of [/\\]",
+        ),
     ],
 )
 def test_validate_optional_sensible_regex_at_hook_level(caplog, regex, warning):
@@ -285,6 +290,11 @@ def test_validate_optional_sensible_regex_at_hook_level(caplog, regex, warning):
             r"pre-commit normalizes the slashes in the top-level 'files' field "
             r'to forward slashes, so you can use / instead of [\/]',
         ),
+        (
+            r'dir[/\\].*\.py',
+            r"pre-commit normalizes the slashes in the top-level 'files' field "
+            r'to forward slashes, so you can use / instead of [/\\]',
+        ),
     ],
 )
 def test_validate_optional_sensible_regex_at_top_level(caplog, regex, warning):