문자열 다루기 기본(문제13)

import java.util.regex.*;
 
class Solution {
    public boolean solution(String s) {
        return Pattern.matches("^(\\d{4}|\\d{6})$",s);
    }
}

class Solution {
    public boolean solution(String s) {
        return s.matches("^(\\d{4}|\\d{6})$");
    }
}

class Solution {
    public boolean solution(String s) {
        return s.matches("[0-9]{4}|[0-9]{6}");
    }
}