title: Extracting the id in all these cases
body: <p>How can I always extract the number 11 in all these cases. </p>
  
  <pre><code>id="section-11" 
  id="test-11"
  id="something-11"
  </code></pre>
  
  <p>I do <code>$(this).attr('id');</code> then what do I do next?</p>