HackerRank-Solutions/Java/Strings/Java Regex/Solution.java

/*
     [01]?\\d{1,2}   matches numbers 0-199.
     2[0-4]\\d       matches numbers 200-249
     25[0-5]         matches numbers 250-255
*/
class MyRegex {
    String num = "([01]?\\d{1,2}|2[0-4]\\d|25[0-5])";
    String pattern = num + "." +  num + "." +  num + "." + num;
}