G面经prepare: Pattern Match

设定一个pattern 把 ‘internationalization‘ 变成 ‘i18n‘, 比如word是house，pattern可以是h3e, 3se, 5, 1o1s1等，
给pattern和word，判断是否match，

 1 package DataStreamAverage;
 2 
 3 public class Solution3 {
 4     public boolean check(String s1, String s2) {
 5         return helper(s1, 0, s2, 0);
 6     }
 7     
 8     public boolean helper(String s1, int i1, String s2, int i2) {
 9         if (i1==s1.length() && i2==s2.length()) return true;
10         if (i1==s1.length() || i2==s2.length()) return false;
11         if (isDigit(s2.charAt(i2))) {
12             int num = 0;
13             while (i2<s2.length() && isDigit(s2.charAt(i2))) {
14                 num = num*10 + (int)(s2.charAt(i2)-‘0‘);
15                 i2++;
16             }
17             if (i1+num > s1.length()) return false;
18             return helper(s1, i1+num, s2, i2);
19         }
20         else {
21             if (s1.charAt(i1) != s2.charAt(i2)) return false;
22             return helper(s1, i1+1, s2, i2+1);
23         }
24     }
25     
26     public boolean isDigit(char c) {
27         if (c>=‘0‘ && c<=‘9‘) return true;
28         else return false;
29     }
30     
31     
32     /**
33      * @param args
34      */
35     public static void main(String[] args) {
36         // TODO Auto-generated method stub
37         Solution3 sol = new Solution3();
38         boolean res = sol.check("houskjfjjdkse", "h11e");
39         if (res) System.out.println("True");
40         else System.out.println("false");
41     }
42 
43 }