def check_for_multiple(files):
 for regex in _RE_MULTIPLE:
  matched_files = check_for_sequence(regex, files)
  if matched_files:
   return matched_files
 return ''

def check_for_multiple ( files ) : for regex in _RE_MULTIPLE : matched_files = check_for_sequence ( regex , files ) if matched_files : return matched_files return ''
return list of files that looks like a multi-part post .