GNU bug report logs - #26580
25.1; inappropriate case folding while isearch-forward-regexp

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Package: emacs; Reported by: ynyaaa@HIDDEN; dated Thu, 20 Apr 2017 17:57:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#26580: 25.1; inappropriate case folding while
 isearch-forward-regexp
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On Fri, 21 Apr 2017, Eli Zaretskii wrote:

>> From: Tino Calancha <tino.calancha@HIDDEN>
>> Date: Fri, 21 Apr 2017 21:16:27 +0900 (JST)
>> Cc: ynyaaa@HIDDEN, Tino Calancha <tino.calancha@HIDDEN>,
>> 	26580 <at> debbugs.gnu.org, Juri Linkov <juri@HIDDEN>
>>
>> C-M-s \T ; matches lower and upper T
>> C-M-s T ; just matches upper T
>>
>> I don't see in the manual this effect on an escaped upper letter.
>
>  (defcustom search-upper-case 'not-yanks
>    "If non-nil, upper case chars disable case fold searching.
>  That is, upper and lower case chars must match exactly.
>  This applies no matter where the chars come from, but does not
>  apply to chars in regexps that are prefixed with `\\'.
>  If this value is `not-yanks', text yanked into the search string
>  in Isearch mode is always downcased."
>    :type '(choice (const :tag "off" nil)
> 		   (const not-yanks)
> 		   (other :tag "on" t)))
>
Great, thanks!
Now it's clear why \A matches both 'a' and 'A'.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26580; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
To: Tino Calancha <tino.calancha@HIDDEN>
Subject: Re: bug#26580: 25.1;
 inappropriate case folding while isearch-forward-regexp
References: <87fuh3t140.fsf@HIDDEN> <87pog6bf7h.fsf@calancha-pc>
 <878tmuyv19.fsf@HIDDEN>
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On Apr 21 2017, Tino Calancha <tino.calancha@HIDDEN> wrote:

> OK, i just picked up \W from you.  Let's changed to \T:

Since \T has no meaning nobody would use it anyway.

Andreas.

-- 
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bug#26580; Package emacs. Full text available.

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Subject: Re: bug#26580: 25.1;
 inappropriate case folding while isearch-forward-regexp
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> From: Tino Calancha <tino.calancha@HIDDEN>
> Date: Fri, 21 Apr 2017 21:16:27 +0900 (JST)
> Cc: ynyaaa@HIDDEN, Tino Calancha <tino.calancha@HIDDEN>,
> 	26580 <at> debbugs.gnu.org, Juri Linkov <juri@HIDDEN>
> 
> C-M-s \T ; matches lower and upper T
> C-M-s T ; just matches upper T
> 
> I don't see in the manual this effect on an escaped upper letter.

  (defcustom search-upper-case 'not-yanks
    "If non-nil, upper case chars disable case fold searching.
  That is, upper and lower case chars must match exactly.
  This applies no matter where the chars come from, but does not
  apply to chars in regexps that are prefixed with `\\'.
  If this value is `not-yanks', text yanked into the search string
  in Isearch mode is always downcased."
    :type '(choice (const :tag "off" nil)
		   (const not-yanks)
		   (other :tag "on" t)))




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On Fri, 21 Apr 2017, Andreas Schwab wrote:

> On Apr 21 2017, Tino Calancha <tino.calancha@HIDDEN> wrote:
>
>> I'm also wondering if \W should do what is doing.  Is it documented
>> somewhere that the slash does not trigger case sensitivity?
>
> \W has nothing to do with case, it's just a non-word character.  Same
> for \cC.
OK, i just picked up \W from you.  Let's changed to \T:
emacs -Q:
C-M-s \T ; matches lower and upper T
C-M-s T ; just matches upper T

I don't see in the manual this effect on an escaped upper letter.





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bug#26580; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
To: Tino Calancha <tino.calancha@HIDDEN>
Subject: Re: bug#26580: 25.1;
 inappropriate case folding while isearch-forward-regexp
References: <87fuh3t140.fsf@HIDDEN> <87pog6bf7h.fsf@calancha-pc>
 <878tmuyv19.fsf@HIDDEN>
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X-Yow: ..  Should I get locked in the PRINCIPAL'S OFFICE today --
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Date: Fri, 21 Apr 2017 14:04:33 +0200
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On Apr 21 2017, Tino Calancha <tino.calancha@HIDDEN> wrote:

> I'm also wondering if \W should do what is doing.  Is it documented
> somewhere that the slash does not trigger case sensitivity?

\W has nothing to do with case, it's just a non-word character.  Same
for \cC.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26580; Package emacs. Full text available.

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On Fri, 21 Apr 2017, Andreas Schwab wrote:

> On Apr 21 2017, Tino Calancha <tino.calancha@HIDDEN> wrote:
>
>> A capital letter triggers a case sensitive search.  In your last example,
>> upper letter C turned on the case sensitive search.  It might be argue
>> if that should happen in this case.  I think the current way is handy.
>
> IMHO that is a bug.  Just like \W doesn't trigger it, \cC should not do
> it either.
Yeah, it looks strange.  I would say, if \W doesn't trigger, then c\C 
would not either (\cC might do, because the upper case is not escaped).

I'm also wondering if \W should do what is doing.  Is it documented 
somewhere that the slash does not trigger case sensitivity?




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To: Tino Calancha <tino.calancha@HIDDEN>
Subject: Re: bug#26580: 25.1;
 inappropriate case folding while isearch-forward-regexp
References: <87fuh3t140.fsf@HIDDEN> <87pog6bf7h.fsf@calancha-pc>
X-Yow: A KAISER ROLL?!  What good is a Kaiser Roll without a little
 COLE SLAW on the SIDE?
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On Apr 21 2017, Tino Calancha <tino.calancha@HIDDEN> wrote:

> A capital letter triggers a case sensitive search.  In your last example,
> upper letter C turned on the case sensitive search.  It might be argue
> if that should happen in this case.  I think the current way is handy.

IMHO that is a bug.  Just like \W doesn't trigger it, \cC should not do
it either.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26580; Package emacs. Full text available.

Message received at 26580 <at> debbugs.gnu.org:


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From: Tino Calancha <tino.calancha@HIDDEN>
To: ynyaaa@HIDDEN
Subject: Re: bug#26580: 25.1;
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References: <87fuh3t140.fsf@HIDDEN>
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ynyaaa@HIDDEN writes:

> 'M-C-s \A' matches both lower letter a and upper letter A.
> 'M-C-s [\A]' matches \ and lower letter a and upper letter A.
> 'M-C-s \cCa' matches =E4=B8=80a, but does not match =E4=B8=80A.

Thanks for the report.  I guess this is a feature.
A capital letter triggers a case sensitive search.  In your last example,
upper letter C turned on the case sensitive search.  It might be argue
if that should happen in this case.  I think the current way is handy.
Maybe we should mention about this in the `isearch-forward' docstring.

In the former examples the slash somehow prevents this to happen.  For inst=
ance,
if you don't escape 'A' in the first example, then the search will match ju=
st 'A'.

Try the following:
'M-C-s A' matches upper letter A.
'M-C-s [a\]' matches \ and lower letter a and upper letter A.
'M-C-s [A\]' matches \ and upper letter A.

'M-C-s \cca' matches =E4=B8=80a, and =E4=B8=80A.
'M-C-s \ccA' just matches =E4=B8=80A.
'M-C-s \cCA' just matches =E4=B8=80A.
'M-C-s \cCa' just matches =E4=B8=80a.

Of couse, you always can toggle the case sensitivity during
those searches with M-c:
'M-C-s A M-c' matches both lower letter a and upper letter A.
'M-C-s \cCa M-c' matches =E4=B8=80a, and =E4=B8=80A.


Regards,
Tino




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26580; Package emacs. Full text available.

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Subject: 25.1; inappropriate case folding while isearch-forward-regexp
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'M-C-s \A' matches both lower letter a and upper letter A.
'M-C-s [\A]' matches \ and lower letter a and upper letter A.
'M-C-s \cCa' matches 一a, but does not match 一A.




In GNU Emacs 25.1.1 (i686-w64-mingw32)
 of 2016-09-18 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 6.0.6002
Configured using:
 'configure --host=i686-w64-mingw32 --without-dbus
 --without-compress-install CFLAGS=-static'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: JPN
  locale-coding-system: cp932

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils
misearch multi-isearch help-mode easymenu cl-loaddefs pcase cl-lib
time-date mule-util japan-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp disp-table
w32-win w32-vars term/common-win tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)

Memory information:
((conses 8 92081 7564)
 (symbols 32 19681 0)
 (miscs 32 54 161)
 (strings 16 15921 3924)
 (string-bytes 1 430154)
 (vectors 8 13169)
 (vector-slots 4 519590 4478)
 (floats 8 165 28)
 (intervals 28 217 13)
 (buffers 520 19))




Acknowledgement sent to ynyaaa@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#26580; Package emacs. Full text available.
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