title: Python Regex capture multiple sections within string
body: <p>I have string that are always of the format <code>track-a-b</code> where <code>a</code> and <code>b</code> are integers.<br>
  For example:<br>
  <code>track-12-29</code><br>
  <code>track-1-210</code><br>
  <code>track-56-1</code></p>
  
  <p>How do I extract <code>a</code> and <code>b</code> from such strings in python?</p>