          result = check_url_config(None)
          self.assertEqual(len(result), 1)
          warning = result[0]
          self.assertEqual(warning.id, '2_0.W001')
          expected_msg = "Your URL pattern '(?P<named-group>\\d+)' has a route"
          self.assertIn(expected_msg, warning.msg)
  
      @override_settings(ROOT_URLCONF='check_framework.urls.path_compatibility.beginning_with_caret')
      def test_beginning_with_caret(self):
          result = check_url_config(None)
 
</s> remove     r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>\w+)>'
 </s> add     r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>[^>]+)>' </s> remove     def test_non_identifier_parameter_name_causes_exception(self):
 </s> add     def test_integer_parameter_name_causes_exception(self): </s> remove     path(r'(?P<named-group>\d+)', lambda x: x),
 </s> add     path(r'(?P<named_group>\d+)', lambda x: x), </s> remove         'sitemaps/kml/<label>/<<model>/<field_name>.kmz',
 </s> add         'sitemaps/kml/<label>/<model>/<field_name>.kmz',
        expected_msg = "Your URL pattern '(?P<named_group>\\d+)' has a route"
          result = check_url_config(None)
          self.assertEqual(len(result), 1)
          warning = result[0]
          self.assertEqual(warning.id, '2_0.W001')
        expected_msg = "Your URL pattern '(?P<named_group>\\d+)' has a route"
          self.assertIn(expected_msg, warning.msg)
  
      @override_settings(ROOT_URLCONF='check_framework.urls.path_compatibility.beginning_with_caret')
      def test_beginning_with_caret(self):
          result = check_url_config(None)
keep keep keep keep replace keep keep keep keep keep
 Fixed #31459 -- Fixed handling invalid indentifiers in URL path conversion.

This patch adjusted existing tests that used invalid identifiers. 
tests/check_framework/test_urls.py