Function IsHexDigit

internal/stringutil/util.go:79–81

(ch rune)

}

func IsHexDigit(ch rune) bool {
	return ch >= '0' && ch <= '9' || ch >= 'A' && ch <= 'F' || ch >= 'a' && ch <= 'f'
}

func IsASCIILetter(ch rune) bool {
	return ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z'