title: Group by substring
body: <p>I have a field with text like "<code>/site/index?sid=18&amp;sub=321333&amp;tid=site.net&amp;ukey=1234543254</code>".  </p>
  
  <p>How can I group it by part of string( '<code>sid</code>' url param e.g.)?<br>
  And params may be in a different order.(<code>sid</code> on the end of line and etc.)</p>