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Postings from May 2003
On Tue, May 13, 2003 at 03:36:07PM -0000, A.Bergman (via RT) wrote:
>
> On tisdag, maj 13, 2003, at 01:35 Europe/Stockholm,
> esp5@mdss03.comp.pge.com (via RT) wrote:
>
> >
> > The following script dumps core on both perl-5.8.0 and perl-5.6.1 -
> > it's probably
> > due to a design limitation in the regular expression engine, and I'm
> > interested to
> > hear any workarounds.
> >
> >
> >
>
> There regex engine should be rewritten to be iterative instead of
> recursive, authority has said that this should be simple but noone has
> stepped up with patches.
I was thinking about this a bit, (especially in conjunction with 'push(@INC, \&ref)),
and was wondering how easy/acceptable it would be to extend the regex engine (yet again)
- in a way that would be relatively painless..
I'd like to be able to define a coderef that looks like the following:
my $_coderef = sub { my ($text) = @_;
# text starts from position at which regular expression last
# matched.
# do something with $text, including regular expressions to modify
# pos($text);
# change pos so that the regular expression 'picks up' where the
# sub left off (ie: pos).
}
Then people could write stuff to do particularly difficult regular expressions using
Inline::C, and you could say:
if ($varb =~ m"($balanced_parens)") # is a C call.
{
}
which IMO is far more intuitive (and cleaner) than anything to do with (?...).
Ed
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