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bug#10869: 24.0.93; Index (elisp) `Regexp Special' for backslash syntax
From: |
Drew Adams |
Subject: |
bug#10869: 24.0.93; Index (elisp) `Regexp Special' for backslash syntax |
Date: |
Wed, 22 Feb 2012 09:51:22 -0800 |
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'
- bug#10869: 24.0.93; Index (elisp) `Regexp Special' for backslash syntax,
Drew Adams <=