title: Converting PHP Regex's to Javascript (or what are the differences?)
body: <p>I have a form generator that uses (perl compatible) regexes for ther backend validation.  Since the whole form is being dynamically generated it was fairly trivial to add a bit of jquery and then use the same regexes to validate on the client side pre submission.</p>
  
  <p>However, some of the time the regexes don't behave themselves in Javascript, I am suspecting that either they are not being properly escaped, or contain illegal characters etc.  Anyone knows a way of making sure that the same regex will work on both platforms?</p>