code: def match_entry_line(str_to_match, regex_obj=MAIN_REGEX_OBJ):
      
      match_obj = regex_obj.match(str_to_match)
      if not match_obj:
          error_message = ('Line "%s" is unrecognized by overlay4u. '
                  'This is only meant for use with Ubuntu Linux.')
          raise UnrecognizedMountEntry(error_message % str_to_match)
      return match_obj.groupdict()
docs: Does a regex match of the mount entry string