code: def convert_regex_to_flask_path(url_path):
      
      for token in ["$"]:
          url_path = url_path.replace(token, "")
  
      def caller(reg):
          match_name, match_pattern = reg.groups()
          return '<regex("{0}"):{1}>'.format(match_pattern, match_name)
  
      url_path = re.sub("\(\?P<(.*?)>(.*?)\)", caller, url_path)
  
      if url_path.endswith("/?"):
          # Flask does own handling of trailing slashes
          url_path = url_path.rstrip("/?")
      return url_path
docs: Converts a regex matching url to one that can be used with flask