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From: Henrik Enberg <henrik.enberg@telia.com>
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Subject: Re: [help]regexp in posting styles
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> From:  leon <sdl.web@gmail.com>
> Date:  Sat, 26 Nov 2005 14:06:49 +0000
> 
> Hi all,
> 
> I'm trying to configure posting styles for groups match 'string1' or
> 'string2', I have the following lines in my gnus.el. However, it doesn't
> work. Any ideas?
> 
> 	("^string1\|^string2"         ;;; this line has problems

"^\\(string\\|string2\\)"

Note that the \ is an escape character inside strings, so it must itself
be escaped.