[Python-Dev] sre improvements

[Fredrik Lundh]

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?

conditionals:

    (?(cond)true)
    (?(cond)true|false)

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

(imo, whoever invented that needs help ;-)

</F>