errs = AppendValidation(errs, fmt.Errorf("locality lb failover region should not contain '*' wildcard"))
		}
	}

	return
}

const (
	regionIndex int = iota
	zoneIndex
	subZoneIndex
)

func validateLocalities(localities []string) error {
	regionZoneSubZoneMap := map[string]map[string]map[string]bool{}
	for _, locality := range localities {