code: def _get_id_format(self):
          
          id_format = gf.safe_get(
              self.parameters,
              gc.PPN_TASK_OS_FILE_ID_REGEX,
              self.DEFAULT_ID_FORMAT,
              can_return_none=False
          )
          try:
              identifier = id_format % 1
          except (TypeError, ValueError) as exc:
              self.log_exc(u"String '%s' is not a valid id format" % (id_format), exc, True, ValueError)
          return id_format
docs: Return the id regex from the parameters