title: RegEx Test pattern for LxWxH
body: <p>I am looking for a regex test pattern that can validate a string describing an item's dimensions.  The string would be formatted LxWxH (e.g. 20x40x10).  It should be able to accept either x or X as a separator.</p>
  
  <p>Right now I have:
  <code>/.*?([0-9](?:\s+x\s+[0-9]+[HWD])*)\s*\-?;/</code></p>