title: RegExp expression to target all files in a folder and its subfolders for workbox.routing / service worker
body: <p>Hej!</p>
  
  <p>I'm pretty new to service worker in general, so I hope the question is not (too) dumb. ^^ </p>
  
  <p>I use the workbox plugin (<a href="https://developers.google.com/web/tools/workbox/" rel="nofollow noreferrer">https://developers.google.com/web/tools/workbox/</a>) to handle the service worker. Now I need a RegExp to target all files within a folder and all files within all subfolders in this folder to add them to the list of the service worker cache. I use</p>
  
  <pre><code>workbox.routing.registerRoute
  </code></pre>
  
  <p>to target the files I want to cache with the service worker. 
  Is this possible at all?</p>
  
  <p>Thanks for your help, 
  All the best</p>
  
  <p>Lucas</p>