title: regex string does not contain substring
body: <p>I am trying to match a string which does not contain a substring</p>
  
  <p>My string always starts "http://www.domain.com/"</p>
  
  <p>The substring I want to exclude from matches is ".a/" which comes after the string (a folder name in the domain name)</p>
  
  <p>There will be characters in the string after the substring I want to exclude</p>
  
  <p>For example:</p>
  
  <p>"http://www.domain.com/.a/test.jpg" should not be matched</p>
  
  <p>But "http://www.domain.com/test.jpg" should be</p>