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From: wmperry@gnu.org (William M. Perry)
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Subject: Re: header-action.el related.
Date: 21 Jun 2001 22:07:34 -0500
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Jinhyok Heo <novembre@ournature.org> writes:

> I want to use different signature depending on some header, e.g. To or
> From. And I found header-action.el would satisfy me. But I got some
> problem with regexp. Help me!

> I wanted to use '.signature' with the addresses containing 'abc.com' and
> 'def.com'. And I want to use '.signature_2' otherwise.
> 
> I cannot express that with lisp regexp. I thought it would be
> '[^(abc.com)]|[^(def.com)]' with some back slashes. I tried many
> possible combinations, but it failed.
>
> My configuration is similar with the following:
> 
> ;;; my header-action setting
> (setq header-action-list
>       '(
> 	("\\(From\\|To\\|Cc\\|Reply-to\\):"
> 	 ("\\(abc\\.com\\|def\\.com\\)"

The problem is that header-action sticks the \\( and \\) around your
regular expression for you, so you end up with:

^\\(From\\|To\\|Cc\\|Reply-to\\):\\s-*.*\\(\\(abc\\.com\\|def\\.com\\)\\)$

The extra () grouping shouldn't be too big of a problem, but that $
might... If you are replying to someone and their email address looks like:

To: William M. Perry <wmperry@abc.com>

It won't match because of the '>' at the end of the line.  If you sent to
just wmperry@abc.com it would probably work.

It looks like you need to construct your regular expression so that it
includes things _after_ the email address as well.

What if you use:

\\(abc\\|def\\)\\.com.*

This is all just from a quick perusal of the header-action.el code -
don't sue me if I'm wrong. :)

-bp
-- 
Ceterum censeo vi esse delendam