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bug#26338: 26.0.50; Collect all matches for REGEXP in current buffer

From: Tino Calancha
Subject: bug#26338: 26.0.50; Collect all matches for REGEXP in current buffer
Date: Wed, 5 Apr 2017 20:58:51 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Tue, 4 Apr 2017, Marcin Borkowski wrote:

Any interest in something like this?:

(defmacro with-collect-matches (regexp &optional group &rest body)
  "Collect matches for REGEXP and eval BODY for each match.
BODY is evaluated with `it' bound to the match.
Optional GROUP if non-nil, then is the regexp group to save.  Otherwise,
save the whole match."

Sorry if this was said already, but why a macro and not a map-like
No special reason.  It's the second idea which came to my mind after
my initial proposal was declined.  Maybe because is shorter to do:
(with-collect-matches regexp)
(foo-collect-matches regexp nil #'identity)

if you are just interested in the list of matches.  Implementing it as
a map function might be also nice.  Don't see a big enthusiasm on
the proposal, though :-(

So far people think that it's easy to write a while loop. I wonder if they think the same about the existence of `dolist': the should
never use it and always write a `while' loop instead.  Don't think they
do that anyway.

I will repeat it once more. I find nice, having an operator returning a list with matches for REGEXP. If such operator, in addition, accepts a body of code or a function, then i find this operator very nice
and elegant.


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