// whereas scheme/method/authority does not:
			// https://github.com/envoyproxy/envoy/blob/v1.29.2/api/envoy/type/matcher/string.proto#L38
			errs = appendErrors(errs, validateStringMatchRegexp(match.GetUri(), "uri"))
			errs = appendErrors(errs, validateStringMatch(match.GetScheme(), "scheme"))
			errs = appendErrors(errs, validateStringMatch(match.GetMethod(), "method"))

		if sm.GetPrefix() == "" {
			return fmt.Errorf("%q: prefix string match should not be empty", where)
		}
	case *networking.StringMatch_Regex:
		return validateStringMatchRegexp(sm, where)
	}
	return nil
}

func validateStringMatchRegexp(sm *networking.StringMatch, where string) error {
	switch sm.GetMatchType().(type) {
	case *networking.StringMatch_Regex:
	default:
		return nil
	}