GNU bug report logs -
#10869
24.0.93; Index (elisp) `Regexp Special' for backslash syntax
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Reported by: "Drew Adams" <drew.adams <at> oracle.com>
Date: Wed, 22 Feb 2012 17:55:01 UTC
Severity: minor
Found in version 24.0.93
Done: Chong Yidong <cyd <at> gnu.org>
Bug is archived. No further changes may be made.
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Report forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#10869
; Package
emacs
.
(Wed, 22 Feb 2012 17:55:02 GMT)
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Acknowledgement sent
to
"Drew Adams" <drew.adams <at> oracle.com>
:
New bug report received and forwarded. Copy sent to
bug-gnu-emacs <at> gnu.org
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(Wed, 22 Feb 2012 17:55:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
emacs -Q
C-h i ; choose Elisp
i backslash
Shows only these index entries:
backslash in character constant
backslash in strings
backslash in symbols
But it is vital for Emacs Lisp users to know about escaping backslashes
in Lisp strings intended to represent regexps: escape \ once for the
regexp syntax, and escape that again for the Lisp string syntax.
What's needed is an index entry for `(elisp) `Regexp Special', which
node explains:
Note that `\' also has special meaning in the read syntax of Lisp
strings (*note String Type::), and must be quoted with `\'. For
example, the regular expression that matches the `\' character is
`\\'. To write a Lisp string that contains the characters `\\',
Lisp syntax requires you to quote each `\' with another `\'.
Therefore, the read syntax for a regular expression matching `\'
is `"\\\\"'.
In GNU Emacs 24.0.93.1 (i386-mingw-nt5.1.2600)
of 2012-02-15 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
`configure --with-gcc (4.6) --no-opt --enable-checking --cflags
-ID:/devel/emacs/libs/libXpm-3.5.8/include
-ID:/devel/emacs/libs/libXpm-3.5.8/src
-ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
-ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
-ID:/devel/emacs/libs/giflib-4.1.4-1/include
-ID:/devel/emacs/libs/jpeg-6b-4/include
-ID:/devel/emacs/libs/tiff-3.8.2-1/include
-ID:/devel/emacs/libs/gnutls-3.0.9/include'
Information forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#10869
; Package
emacs
.
(Sat, 25 Feb 2012 04:08:02 GMT)
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Message #8 received at 10869 <at> debbugs.gnu.org (full text, mbox):
"Drew Adams" <drew.adams <at> oracle.com> writes:
> What's needed is an index entry for `(elisp) `Regexp Special'
Fixed, thanks.
bug closed, send any further explanations to
10869 <at> debbugs.gnu.org and "Drew Adams" <drew.adams <at> oracle.com>
Request was from
Chong Yidong <cyd <at> gnu.org>
to
control <at> debbugs.gnu.org
.
(Sat, 25 Feb 2012 04:08:03 GMT)
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bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
to
internal_control <at> debbugs.gnu.org
.
(Sat, 24 Mar 2012 11:24:04 GMT)
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This bug report was last modified 12 years and 45 days ago.
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