title: RegEx: Not contain specific file types
body: <p>I'm searching for a regular expression that hits everything that is NOT ending with <code>".png"</code> or <code>".jpg"</code>. I want to find out URLs that do not request an image file.</p>
  
  <p>I found something like this: <code>([^\s]+(\.(?i)(jpg|png))$)</code> but this is pretty much the opposite of what I want.</p>
  
  <p>Is there an easy way to reverse this? Or is this expression totally wrong?!</p>
  
  <p>Thanx in advance.
  Jan</p>