Re: How do I search for pattern A followed by NOT pattern A ?

Brilliant, that's exactly what I needed.

Thanks very much.

- RJA

On Nov 1, 11:33 pm, Tim Chase <v...@tim.thechases.com> wrote:
> On 11/01/11 06:03, RJA wrote:
>
> > if I have the buffer below,
>
> > ppppp 1 2 3 4 5
> > ppppp 1 2 3 4 5
> > ppppv 1 2 3 4 5
> > ppppp 1 2 3 4 5
>
> > I can type thesearch
>
> > /\(ppppp\).*\n\1.*
>
> > which will match against the first two lines
>
> > However, I want to pick out lines 2 and 3. How can I do that ?
>
> For this particular case, you cansearchfor
>
>    ^\(.....\).*\n\1\@!
>
> Note that the "\@!" matches the previous atom, so if you're doing
> something more complex than the single "\1" atom, you need to
> wrap it in grouping-parens, whether capturing "\(...\)" or
> non-capturing "\%(...\)".
>
> Also note that the 4th (last) line will be matched because the
> following line doesn't start with thepatternon the current
> line.  If you want to mitigate, just change thepatternto
>
>    ^\(.....\).*\n\1\@!.....
>
> to assert there are 5 things there.  Thosse "....." could also be
> written as ".\{5}" for what it's worth.
>
> For more reading, you can
>
>    :help /\@!
>
> and the surrounding sections regarding the Perl-ish tokens.
>
> -tim

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