//https://www.hackerrank.com/challenges/matching-one-or-more-repititions
public class Solution {    
  public static void main(String[] args) {
    Regex_Test tester = new Regex_Test();
    tester.checker("^\\d+[A-Z]+[a-z]+$");
  }
}

Create matching-one-or-more-repititions.java