Refs #32499 -- Fixed escaped metacharacters in simplify_regex().

django/contrib/admindocs/utils.py

@@ -144,7 +144,11 @@ unnamed_group_matcher = _lazy_re_compile(r'\(')
 
 def replace_metacharacters(pattern):
     """Remove unescaped metacharacters from the pattern."""
-    return pattern.replace('^', '').replace('$', '').replace('?', '')
+    return re.sub(
+        r'((?:^|(?<!\\))(?:\\\\)*)(\\?)([?^$])',
+        lambda m: m[1] + m[3] if m[2] else m[1],
+        pattern,
+    )
 
 
 def replace_named_groups(pattern):