title: RegEx for a string to NOT contain two different strings
body: <p>Ok you gurus out there who know Regex!</p>
  
  <p>How do you use reg ex to search a string to make sure it doesn't contain either of two different strings.</p>
  
  <p>Example: Say i want to make sure "FileNTile" doesnt contain File or Tile</p>
  
  <p>Thanks</p>
  
  <p>cnorr</p>