I thought that was the most likely solution, although it might be that
one would want to break the task into a template and a number of
regular expressions, anyway I was wondering if anyone knew of such a
solution already?

cheers,
Bryan Rasmussen

> Short of writing a regular expression that only matches valid regular
> expressions (which sounds like an interesting exercise for the reader),

along with other interesting exercises like trisecting angles and
squaring the circle, presumably:-)

David