title: how to get last three words of a string?
body: <p>I have a string containing this:</p>
  
  <blockquote>
    <p><code>D:\ptc\Windchill_10.0\Windchill\wtCustom\wt\lifecycle\StateRB.rbInfo</code>.</p>
  </blockquote>
  
  <p>I want to get just this part:</p>
  
  <blockquote>
    <p><code>wt\lifecycle\StateRB</code></p>
  </blockquote>
  
  <p>How can I do that?</p>