package Chapter8;
/*
 * '.', 任意字元
 * '*', 任意次數
 */
public class _53_regular_expressions_matching {
	public static void main(String[] args) {
//		char []pattern = {'a', '.', 'a'};
//		char []pattern = {'a', 'b', '*', 'a', 'c', '*', 'a'};
//		char []pattern = {'a', 'a', '.', 'a'};
		char []pattern = {'a', 'a', '.', 'a'};
		char []ch = {'a', 'b', '*', 'a'};
		if (new _53_function().match(pattern, 0, ch, 0)) {
			System.out.println("yes");
		} else {
			System.out.println("no");
		}
	}
}
class _53_function {
	boolean match(char []pattern, int pindex, char []ch, int cindex) {
		if (cindex == ch.length && pindex == pattern.length) return true;
		if (pindex != pattern.length && cindex != ch.length) {
			if (pattern[pindex] == ch[cindex] || pattern[pindex] == '.') {
				return match(pattern, pindex + 1, ch, cindex + 1);
			} else if (pattern[pindex] == '*') {
				if (pattern[pindex - 1] == ch[cindex] || pattern[pindex] == '.') {
					return match(pattern, pindex, ch, cindex + 1);
				} else {
					return match(pattern, pindex + 1, ch, cindex);
				}
			} else if (pattern[pindex + 1] == '*'){
				return match(pattern, pindex + 1, ch, cindex);
			} else {
				return false;
			} 
		} else {
			return false;
		}
	}
}