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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: Characterset for Abbrevation names limited
Date: Fri, 22 Jun 2007 15:20:29 -0400
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To: Wilmar Igl <wilmar.igl@gmx.de>
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Wilmar Igl wrote:

> sofar it is not possible to use characters other the [a-Z][0-9] as names 
> of abbreviations when using <add-global-abbreviation>.
> To avoid conflicts with emacs abbreviations and other acronyms used in 
> the text I would suggest to allow non-alphabetical/non-number characters 
> like, [!"#%&/].

It's not that simple. Because of the way abbrevs are expanded, the
characters in an abbrev must all be recognized as part of a word.
So in general it's not possible to allow arbitrary characters (eg `!')
in abbrevs. In specific modes that change the syntax of some
characters to be word constituents, these characters can be used in
abbrevs.