docs: def _extract_meta_value(self, tag):
          # type: (str, List[str]) -> str
          """Find a target value by `tag` from given meta data.
  
          :param tag: str
          :param meta_data: list
          :return: str
          """
          try:
              return [l[len(tag):] for l in self.meta_data if l.startswith(tag)][0]
          except IndexError:
              return '* Not Found *'