Refs #27025, #28593 -- Fixed "invalid escape sequence" warnings in urls/resolvers.py.

django/urls/resolvers.py

@@ -119,7 +119,7 @@ class CheckURLMixin:
             # Skip check as it can be useful to start a URL pattern with a slash
             # when APPEND_SLASH=False.
             return []
-        if regex_pattern.startswith(('/', '^/', '^\/')) and not regex_pattern.endswith('/'):
+        if regex_pattern.startswith(('/', '^/', '^\\/')) and not regex_pattern.endswith('/'):
             warning = Warning(
                 "Your URL pattern {} has a route beginning with a '/'. Remove this "
                 "slash as it is unnecessary. If this pattern is targeted in an "
@@ -187,7 +187,7 @@ class RegexPattern(CheckURLMixin):
 
 
 _PATH_PARAMETER_COMPONENT_RE = re.compile(
-    '<(?:(?P<converter>[^>:]+):)?(?P<parameter>\w+)>'
+    r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>\w+)>'
 )