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From: Karl Kleinpaste <karl@charcoal.com>
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Subject: Re: Case sensitive split
Date: Tue, 16 Jul 2002 09:16:38 -0400
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arne_caspari@lxserver.dbs.de writes:
> How do I tell the regexp to match only uppercase letters?

(add-hook 'nnmail-split-hook (lambda nil (setq case-fold-search nil)))

I don't use fancy splitting, but in ordinary splitting, this is the
way to catch what you want:

("tomb"			"Subject: \\(Re: \\)?[^a-z]+$")

That is, it's not sufficient to catch a bunch of uppercase.  You have
to catch the _lack_ of _lowercase_.