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  1. Prepare
  2. Regex
  3. Applications
  4. Alien Username
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Alien Username

  • atxixwrld
     + 0 comments
       public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
   
   Scanner sc = new Scanner(System.in);
   
   int no = sc.nextInt();
   sc.nextLine();
   
   
   String regex = "^[_\\.](?<=[_\\.])\\d+[a-zA-Z]*_?";
   Pattern p = Pattern.compile(regex);
   
   
   for (int i = 0; i<no; i++){
    String s = sc.nextLine();

   if(p.matcher(s).matches()){

    System.out.println("VALID");
    
   }
   else{
    System.out.println("INVALID");
   }
    }