GNU bug report logs - #32328
match-beginning: return nil if search failed

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Package: emacs;

Reported by: Andreas Röhler <andreas.roehler <at> easy-emacs.de>

Date: Tue, 31 Jul 2018 05:57:01 UTC

Severity: wishlist

Tags: notabug

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#32328; Package emacs. (Tue, 31 Jul 2018 05:57:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Andreas Röhler <andreas.roehler <at> easy-emacs.de>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Tue, 31 Jul 2018 05:57:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
To: bug-gnu-emacs <at> gnu.org
Subject: match-beginning: return nil if search failed
Date: Tue, 31 Jul 2018 07:59:06 +0200

match-beginning tells: Return value is undefined if the last search failed.

Consider it a gain if it returns nil when failing.

Thanks,
Andreas
GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.14.5) of 
2018-05-29
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#32328; Package emacs. (Wed, 01 Aug 2018 14:40:01 GMT) Full text and rfc822 format available.

Message #8 received at 32328 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
Cc: 32328 <at> debbugs.gnu.org
Subject: Re: bug#32328: match-beginning: return nil if search failed
Date: Wed, 01 Aug 2018 17:39:46 +0300

Andreas Röhler <andreas.roehler <at> easy-emacs.de> writes:

> match-beginning tells: Return value is undefined if the last search failed.
>
> Consider it a gain if it returns nil when failing.

I think match-string already implicitly relies on the suggested
behaviour; compare its docstring:

  Value is nil if NUMth pair didn't match, or there were less than NUM pairs.

with its implementation:

  (if (match-beginning num)
      (if string
          (substring string (match-beginning num) (match-end num))
        (buffer-substring (match-beginning num) (match-end num))))

-- 
Basil
Added tag(s) notabug. Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Sat, 13 Jul 2019 03:07:01 GMT) Full text and rfc822 format available.
bug closed, send any further explanations to 32328 <at> debbugs.gnu.org and Andreas Röhler <andreas.roehler <at> easy-emacs.de> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Sat, 13 Jul 2019 03:07:01 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sat, 10 Aug 2019 11:24:06 GMT) Full text and rfc822 format available.
This bug report was last modified 4 years and 261 days ago.

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