title: How to Extract a Custom URL Parameter in Google Data Studio?
body: <p>I am trying to track performance of a URL parameter using Google Data Studio. The URL looks like this:</p>
  <pre><code>https://example.com/?gclid=something&amp;extension=me-trying-stuff
  </code></pre>
  <p>I want to get <code>me-trying-stuff</code> at the end of <code>&amp;extension</code>.</p>