leetgo/regx/regx.go

package regx

func isCharMatch(text, pattern string) bool {
	return pattern[0] == '.' || pattern[0] == text[0]
}

func matchStar(text, pattern string) bool {
	for {
		switch {
		case isMatch(text, pattern[2:]):
			return true
		case text == "" || !isCharMatch(text, pattern):
			return false
		default:
			text = text[1:]
		}
	}
}

func isMatch(text, pattern string) bool {
	switch {
	case pattern == "":
		return text == ""
	case len(pattern) >= 2 && pattern[1] == '*':
		return matchStar(text, pattern)
	case text != "" && isCharMatch(text, pattern):
		return isMatch(text[1:], pattern[1:])
	}

	return false
}

func IsMatch(text, pattern string) bool {
	return isMatch(text, pattern)
}