From: Hugh Sasse Staff Elec Eng <hgs@...>
Date: 2003-12-03T23:46:03+09:00
Subject: Re: Some Regexp

On Wed, 3 Dec 2003, Robert Klemme wrote:

>
> "Hugh Sasse Staff Elec Eng" <hgs@dmu.ac.uk> schrieb im Newsbeitrag
> news:Pine.GSO.4.58.0312031220260.10895@neelix...
> >
> > Interesting.  This doesn't cope with nesting though.  I've just
> > tried that out.  Is there a good way to do that with scan?
>
> Do you mean nesting of TEXT1...TEXT2 sections within each other?  That

Yes.

> can't be done with regexps.  You need a context free parser for that.

Is this a limitation inherent in regexps, or just as they are
implemented now?  I ask, because Lua (which uses % where we use \
for things like \w, \d etc) has %bxy which matches a balanced x y
pair and its contents.  Eg %b() would match the whole of
"(an (example))".   The delimiters being one character only couldn't
make a difference here, or could it?

>
> Cheers
>
>     robert

        Hugh