code: def previous(self, match, predicate=None, index=None):
          
          current = match.start
          while current > -1:
              previous_matches = self.ending(current)
              if previous_matches:
                  return filter_index(previous_matches, predicate, index)
              current -= 1
          return filter_index(_BaseMatches._base(), predicate, index)
docs: Retrieves the nearest previous matches.
          :param match:
          :type match:
          :param predicate:
          :type predicate:
          :param index:
          :type index: int
          :return:
          :rtype: