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  1. Prepare
  2. Java
  3. Strings
  4. Java Regex
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Java Regex

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    import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;

class Solution{

    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        while(in.hasNext()){
            String IP = in.next();
            System.out.println(IP.matches(new MyRegex().pattern));
        }

    }
}
class MyRegex{
    String p = "(([0-1]?[0-9]?[0-9])|(2[0-4][0-9])|(25[0-5]))";
    //String p = "(([0-1]?([0-9]{1,2}))|(2[0-4][0-9])|(25[0-5]))";
    String pattern= p+"."+p+"."+p+"."+p;
     
}