code: def _match_display_text(self, element_key, string, string_match_type, match):
          
          if string is None or string_match_type is None:
              raise NullArgument()
          match_value = self._get_string_match_value(string, string_match_type)
          self._add_match(element_key + '.text', match_value, match)
docs: Matches a display text value