leetcode/Problem10.java at master · actor168/leetcode · GitHub

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classProblem10 {
publicstaticvoidmain(String[] args) {
Strings = "ab";
Stringp = ".*";
System.out.println(newProblem10().isMatch(s, p));
	}

publicbooleanisMatch(Stringtext, Stringpattern) {
System.out.println(text + " " + pattern);
if (pattern.isEmpty()) returntext.isEmpty();
booleanfirst_match = (!text.isEmpty() &&
 (pattern.charAt(0) == text.charAt(0) || pattern.charAt(0) == '.'));

if (pattern.length() >= 2 && pattern.charAt(1) == '*'){
return (isMatch(text, pattern.substring(2)) ||
 (first_match && isMatch(text.substring(1), pattern)));
 } else {
returnfirst_match && isMatch(text.substring(1), pattern.substring(1));
 }
/*if(s.length() == 0 && p.length() == 0) {
 return true;
 }
 if (s.length() <= 0 || p.length() <= 0) return false;

 char p_pos = p.charAt(0);
 char s_pos = s.charAt(0);

 if (p_pos == '.') {
 p_pos = s.charAt(0);
 }

 if (p_pos != s_pos) {
 // *
 if (p_pos == '*') return isMatch(s.substring(1), p.substring(1));
 if (p.length() >= 2) {
 // 如果下一个是 '*', p往后移2
 if (p.charAt(1) == '*') {
 return isMatch(s, p.substring(2));
 }
 }
 return false;
 }

 if (p.length() >= 2) {
 // 如果下一个是 '*', p往后移2
 if (p.charAt(1) == '*') {// aa a*
 if (s.charAt(1) == s_pos) return isMatch(s.substring(1), p.substring(1)) || isMatch(s.substring(1), p.substring(2));
 else return isMatch(s, p.substring(2));
 }
 }

 return isMatch(s.substring(1), p.substring(1));*/
 }
}