[Python-Dev] sre improvements

Fredrik Lundh fredrik@pythonware.com
Wed, 13 Jun 2001 18:32:13 +0200

skip wrote:

>     Gustavo> I'd like, for example, to see the (?(1)blah) operator,
>     Gustavo> available in perl, working.
> For the non-Perl-heads on the list, can you explain what the (?(1)blah)
> operator does?



where cond is a group number (true if defined) or an assertion
pattern, and true/false are patterns.

(imo, whoever invented that needs help ;-)