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 A = "([01]?[0-9]{1,2}|"; String B = "2[0-4][0-9]|"; String C = "25[0-5])"; String octet = A+B+C;
    String pattern = octet+"."+octet+"."+octet+"."+octet;

    } //Write your code here