Function isValidLabelNameStart

expfmt/text_parse.go:720–722

(b byte)

}

func isValidLabelNameStart(b byte) bool {
	return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_'
}

func isValidLabelNameContinuation(b byte) bool {
	return isValidLabelNameStart(b) || (b >= '0' && b <= '9')