code: func IsDNS1123Label(value string) []string {
  	var errs []string
  	if len(value) > DNS1123LabelMaxLength {
  		errs = append(errs, MaxLenError(DNS1123LabelMaxLength))
  	}
  	if !dns1123LabelRegexp.MatchString(value) {
  		errs = append(errs, RegexError(dns1123LabelErrMsg, dns1123LabelFmt, "my-name", "123-abc"))
  	}
  	return errs
  }
docs: // IsDNS1123Label tests for a string that conforms to the definition of a label in
  // DNS (RFC 1123).