Regex . *

regexDotStar.kt

    fun isMatch(word: String, pattern: String): Boolean {
        if (pattern.length == 2 && pattern[0] == '.' && pattern[1] == '*') {
            // recursively if we ever get to this, we know to return true regardless
            return true
        }

        if (word.isEmpty() && pattern.isEmpty()) {
            return true
        }

        if (word.isEmpty()) {
            if (pattern.length > 1 && pattern[1] == '*') {
                return isMatch(word, pattern.substring(2, pattern.length))
            }
            return false
        }

        if (pattern.isEmpty()) {
            return false
        }

        if (pattern.length > 1 && pattern[1] == '*') {
            if (isMatch(word, pattern.substring(2, pattern.length)) == false) {
                if (word[0] == pattern[0] || pattern[0] == '.') {
                    return isMatch(word.substring(1, word.length), pattern)
                }
                return false
            }
            return true
        }

        if (pattern[0] == '.' || pattern[0] == word[0]) {
            return isMatch(word.substring(1, word.length), pattern.substring(1, pattern.length))
        } else {
            return false
        }
    }