title: How to increment numeric part of a string by one?
body: <p>I have a string formed up by numbers and sometimes by letters.  </p>
  
  <p>Example <code>AF-1234</code> or <code>345ww</code>.</p>
  
  <p>I have to get the numeric part and increment it by one.<br>
  how can I do that? maybe with regex?</p>