title: get value after last slash (/)
body: <p>I can get background image by doing </p>
  
  <pre><code>$('#item').css('background-image').
  </code></pre>
  
  <p>but the result is <code>url('www.example.com/something/123.png')</code></p>
  
  <p>How can get get only the 123 value? I can't use string position because the value of the img name doesn't' necessary is 3 characters. </p>