code: def matches(self, pattern):
          
          return ArrayPredicate(
              term=self,
              op=LabelArray.matches,
              opargs=(pattern,),
          )
docs: Construct a Filter that checks regex matches against ``pattern``.
  
          Parameters
          ----------
          pattern : str
              Regex pattern against which to compare values produced by ``self``.
  
          Returns
          -------
          matches : Filter
              Filter returning True for all sid/date pairs for which ``self``
              produces a string matched by ``pattern``.
  
          See Also
          --------
          :mod:`Python Regular Expressions <re>`