title: Validating string format(pattern) input
body: <p>Im trying to figure out how to validate the users input.I want the user to input 
  something like a1 or B6.The input should be in the following pattern. letter from a to h followed by a 
  number from 1 to 8, [String-number].Also the letter should be accepted either if it is capital either not.Here is my code.Any help is very much appreciated!</p>
  
  <pre><code>private void getUserInput() {
      Scanner scan = new Scanner(System.in);
  
      userGuess1 = scan.nextLine();
     // Here i should validate if the input is in the right format
      userGuess = userGuess1;
  </code></pre>