t**r
发帖数: 3428 | 3 public class T10 {
static boolean matchFirst(String s, String p){
System.out.println("in matchFirst: s is "+s+",p is: "+p+";");
System.out.println("s is empty "+ s.isEmpty());
System.out.println("p is empty "+ p.isEmpty());
if(s.isEmpty() ^ p.isEmpty()) return false;
if(s.isEmpty() && p.isEmpty()) return true;
return ( s.charAt(0)==p.charAt(0) || p.charAt(0)=='.' );
}
public static boolean isMatch(String s, String p) {
if (p.isEmpty() )return (s.isEmpty());
if(p.length()==1 || p.charAt(1)!='*') {
if(!matchFirst(s,p)) return false;
return isMatch(s.substring(1), p.substring(1));
} else {
if (isMatch(s, p.substring(2))) return true;
while(true){
if(isMatch(s, p.substring(2))) return true;
if(!matchFirst(s, p)) break;
s=s.substring(1);
}
}
return false;
}
public static void main(String[] args){
String s = "aaa";
String p = "ab*a";
boolean ret = isMatch(s, p);
System.out.println(ret);
}
} |
