title: Check if last characters of an NSString are numbers
body: <p>Is it possible to see of a string ends with a number which length is not known?</p>
  
  <ol>
  <li>"String 1" -> 1</li>
  <li>"String 4356" -> 4356 </li>
  <li>"String" -> nil</li>
  </ol>
  
  <p>If so, how can I determine that number?</p>