Re: add INVERT to re-search-{forward, backward}

[Juri Linkov]

>> Instead of this, I think the change should be done at the occur level,
>> since occur's algorithm is line-based and can skip lines that contain
>> a given regexp.  This could be similar to the algorithm used by the
>> command `flush-lines' in the same file.  `occur' currently works like the
>> command `keep-lines' that keeps lines containing the specified regexp.
>> But with a new INVERT argument, `occur' could work like `flush-lines' that
>> keep everything except lines containing the specified regexp.
>
> This is also similar to grep etc.

Yes, as a line-oriented tool, grep's -v --invert-match option is what
could be modelled in occur.

Then a negative prefix argument of `occur' could mean inverting the
regexp and displaying non-matching lines.

-- 
Juri Linkov
http://www.jurta.org/emacs/