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* bug#20307: 25.0.50; (regexp-opt nil ...) returns ""
@ 2015-04-12  9:50 David Kastrup
  2015-04-12 12:09 ` Stefan Monnier
                   ` (2 more replies)
  0 siblings, 3 replies; 13+ messages in thread
From: David Kastrup @ 2015-04-12  9:50 UTC (permalink / raw)
  To: 20307


Both

M-: (regexp-opt nil) RET

and

M-: (regexp-opt nil t) RET

return "".  However, they should return a regexp matching _nothing_
rather than everything, and the second invocation should also count as
one \(\) pairing.

So something like "[b-a]" and "\([b-a]\)" or
"[^[:unibyte:][:multibyte:]]" or something similarly contorted.



In GNU Emacs 25.0.50.1 (i686-pc-linux-gnu, GTK+ Version 3.12.2)
 of 2015-03-04 on lola
Repository revision: ca2b0e220ee6b2cab538e84703559696ce477e71
Windowing system distributor `The X.Org Foundation', version 11.0.11600000
System Description:	Ubuntu 14.10

Configured using:
 `configure --without-toolkit-scroll-bars'

Configured features:
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NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
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Recent messages:
nnml: Reading incoming mail (no new mail)...done
Reading active file from private via nnml...done
Reading active file from archive via nnfolder...done
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Reading active file from /home/dak3/Mail/family via nndir...done
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Memory information:
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-- 
David Kastrup





^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2019-03-02 15:24 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-04-12  9:50 bug#20307: 25.0.50; (regexp-opt nil ...) returns "" David Kastrup
2015-04-12 12:09 ` Stefan Monnier
2015-04-13 14:08 ` Artur Malabarba
2015-04-13 15:19   ` Stefan Monnier
2015-04-13 15:34   ` David Kastrup
2015-04-13 15:59     ` Artur Malabarba
2019-02-25 14:57 ` bug#20307: [PATCH] make regexp-opt return a no-match return value with empty input Mattias Engdegård
2019-03-02 12:37   ` Eli Zaretskii
2019-03-02 14:21     ` Mattias Engdegård
2019-03-02 14:41       ` Eli Zaretskii
2019-03-02 14:49         ` Mattias Engdegård
2019-03-02 14:57           ` Eli Zaretskii
2019-03-02 15:24             ` Mattias Engdegård

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