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Re: modify .emacs

From: Tim X
Subject: Re: modify .emacs
Date: Thu, 19 May 2005 08:21:39 +1000
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

Peter Dyballa <address@hidden> writes:

> Am 17.05.2005 um 14:55 schrieb Michael Dewar:
> than one cons to auto-mode-alist you can merge them together. It was
> said on this list that \\' is a more precise description of a file
> name's end than $. When using more excessively the regular expressions
> the code can become very hard to understand:
> (setq auto-mode-alist
>    (append
>     '(("\\.\\(xsl\\|id\\[de\\]\\)\\'"                 . sgml-mode)
>       ("\\.\\(plist\\|xml\\|xsl\\|fo\\)\\'"           . xml-mode)
>       ("\\.\\(tgz\\|tar\\.\\(bz2\\|gz\\|Z\\)\\)\\'"   . tar-mode)
>       ("\\.\\(arc\\|jar\\|lzh\\|zip\\|zoo\\)\\'"      . tar-mode)
>     auto-mode-alist)))
Unless I'm missing something, the \\ doesn't have anything to do with
the end of a word - in the RE above, the \\ at the end of literal
atoms is introducing 'special' characters i.e. \\| indicates an
alternative and \\(...\\) a grouping which allows you to reference
parts of the match with $1, $2 etc. The $ matches the end of the
string your trying to match and is as far as I know the best and only
way to match the end of a string.


Tim Cross
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