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  1. Prepare
  2. Java
  3. Strings
  4. Valid Username Regular Expression
  5. Discussions

Valid Username Regular Expression

  • devashis_k2002
     + 0 comments
        public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int size = scanner.nextInt();
        scanner.nextLine();
        for (int i = 0; i < size; i++) {
            System.out.println(scanner.nextLine().matches("[a-zA-Z][a-zA-Z0-9_]{7,29}") ? "Valid" : "Invalid");
        }
        scanner.close();
    }