ah, hadn't thought of that, no doubt due to my poor command of
regular expressions, so it should be implemented as probably a
recursive function that checks the various steps of the regex.
Cheers,
Bryan Rasmussen
On 4/15/07, Michael Kay <mike(_at_)saxonica(_dot_)com> wrote:
I *think* David's point is that the problem is mathematically insoluble: the
grammar for regular expressions is recursive, and regular expressions are
not powerful enough to process a language whose grammar is recursive.
Sorry I suggested it!
Michael Kay
http://www.saxonica.com/
> -----Original Message-----
> From: bryan rasmussen [mailto:rasmussen(_dot_)bryan(_at_)gmail(_dot_)com]
> Sent: 15 April 2007 09:45
> To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
> Subject: Re: [xsl] check the type of the $pattern argument to
> a regular expression?
>
> 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
>
> On 4/15/07, David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> wrote:
> >
> > > 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
> >
> >
> >
> >
> >
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