code: def check_content(self, content_pattern_names, content, encoding):
      
      if not content_pattern_names or not encoding:
        return (), ()
  
      matching = []
      nonmatching = []
      for content_pattern_name in content_pattern_names:
        if self._content_matchers[content_pattern_name].matches(content.decode(encoding)):
          matching.append(content_pattern_name)
        else:
          nonmatching.append(content_pattern_name)
      return tuple(matching), tuple(nonmatching)
docs: Check which of the named patterns matches the given content.
  
      Returns a pair (matching, nonmatching), in which each element is a tuple of pattern names.
  
      :param iterable content_pattern_names: names of content patterns to check.
      :param bytes content: the content to check.
      :param str encoding: the expected encoding of content.