title: Remove unwanted part of String. Regex / JS
body: <p>If I have a string which looks like this:</p>
  
  <pre><code>var myString = '73gf9y::-8auhTHIS_IS_WHAT_I_WANT'
  </code></pre>
  
  <p>What regex would I need to end up with:</p>
  
  <pre><code>'THIS_IS_WHAT_I_WANT'
  </code></pre>
  
  <p>The first part of my String will always be a random assortment of characters. Is there some regex which will remove everything up to <code>THIS</code>?</p>