default:
		return nil
	}
	re := sm.GetRegex()
	if re == "" {
		return fmt.Errorf("%q: regex string match should not be empty", where)
	}
	return validateStringRegexp(re, where)
}

func validateStringRegexp(re string, where string) error {
	// Envoy enforces a re2.max_program_size.error_level re2 program size is not the same as length,