title: How to get the inverse of a regular expression?
body: <p>Let's say I have a regular expression that works correctly to find all of the URLs in a text file:</p>
  
  <pre><code>(http://)([a-zA-Z0-9\/\.])*
  </code></pre>
  
  <p>If what I want is not the URLs but the inverse - all other text except the URLs - is there an easy modification to make to get this?</p>