code: func IsValidLabelValue(value string) []string {
  	var errs []string
  	if len(value) > LabelValueMaxLength {
  		errs = append(errs, MaxLenError(LabelValueMaxLength))
  	}
  	if !labelValueRegexp.MatchString(value) {
  		errs = append(errs, RegexError(labelValueErrMsg, labelValueFmt, "MyValue", "my_value", "12345"))
  	}
  	return errs
  }
docs: // IsValidLabelValue tests whether the value passed is a valid label value.  If
  // the value is not valid, a list of error strings is returned.  Otherwise an
  // empty list (or nil) is returned.