Re: Possible bug(s) in new regex engine involving \@> and \?

On 20:53 Sun 22 Dec , Marcin Szamotulski wrote:
> On 05:52 Sat 21 Dec , Brett Stahlman wrote:
> > Possible bugs in new regex engine involving \@> and \?
> >
> > Using the following line of text...
> > 0123456789
> >
> > ...run the following two :substitute commands with both old and new regex engine, and notice the differences...
> >
> > s/\(01\)\(23\)\@>\(.*\)/--\1--\2--\3/
> > Old (\%=1)
> > --01--23--456789
> > New (\%=2)
> > ----23--456789
> >
> > s/\(01\)\(23\d\@=\)\?\(.*\)/--\1--\2--\3/
> > Old (\%=1)
> > --01--23--456789
> > New (\%=2)
> > --01----23456789
> >
> > Note: The \d\@= in the second example could be replaced with other matching zero-width assertions (e.g., \%v) without changing the results.
> >
> > Brett S.
>
> Hi,
>
> Which version of vim are you using. I cannot reproduce here (Vim
> 7.4.126, GNU/Linux) the first one, but I can reproduce the second one.
>
> Best regards,
> Marcin


It seems that there is a problem with grouping, since event these
patterns fail with 'set re=2':
:s/\(01\)\(23\%(\d\@=\)\)\?\(.*\)/--\1--\2--\3
:s/\(01\)\(23\%(\d\)\@=\)\?\(.*\)/--\1--\2--\3


Best,
Marcin

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