GNU bug report logs - #26338
26.0.50; Collect all matches for REGEXP in current buffer

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From: Juri Linkov <juri <at> linkov.net>
To: Tino Calancha <tino.calancha <at> gmail.com>
Cc: 26338 <at> debbugs.gnu.org
Subject: bug#26338: 26.0.50; Collect all matches for REGEXP in current buffer
Date: Tue, 04 Apr 2017 02:35:29 +0300

>>> What do you think?
>>
>> But there is already the occur-collect feature implemented in occur-1
>> and occur-read-primary-args.  Why would we need a separate command?
> Indeed i don't think we need a new command for this.  I am thinking more
> in an standard function.
> Following:
> (occur "defun\\s +\\(\\S +\\)" "\\1")
>
> doesn't return the collected things.  It writes the matches in *Occur*
> buffer.  Then, if you want a list with the matches you must loop
> again inside *Occur* which is sub-optimal.
> For me, it has sense to have a `occur-collect' which just returns the
> list of matches.
> Then, we might use such function in the implementation of occur-1
> which could bring a cleaner implementation.
> We might get also the LIMIT argument for occur which might come
> in handy for multi-occur with lot of input buffers (just an idea).

occur-collect is intended for interactive use.  As for programmatic use,
Dmitry is right: a universal idiom is (while (re-search-forward ...)).
This is why e.g. the docstring of ‘replace-regexp’ recommends to use
an explicit loop like (while (re-search-forward ...) (replace-match ...))

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