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From: Karl Kleinpaste <karl@charcoal.com>
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Subject: Re: What's wrong with this regexp?
Date: Wed, 07 Nov 2001 14:39:09 -0500
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Frank Schmitt <usereplyto@Frank-Schmitt.net> writes:
> Don't we use the regexp scheme documented under 
> (x)emacs->Searching and Replacement->Regexp search?

Yes, but it's a matter of the lisp reader's context: You have to
double most occurrences of `\' in order to get them into a lisp
expression.  What you type in the minibuffer as "\(a\|b\)" must become
"\\(a\\|b\\)" when used in a string expression in elisp.

BTW, nnmail-split-methods usage is case-insensitive unless you
explicitly turn off case-fold-search in nnmail-split-hook.