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From: Per Abrahamsen <abraham@dina.kvl.dk>
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Subject: Re: how to customize outline mode
Date: Thu, 04 Aug 2005 14:17:49 +0200
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Pete Siemsen <siemsen@ucar.edu> writes:

> How can I set outline-regexp to make Emacs recognize 4 spaces as a
> header delimiter?  I tried "(    )+", which didn't work.

(setq outline-regexp "\\(    \\)+")

\( and \) are used for grouping in Emacs regexps (plain "(" and ")"
just match themselves), and escape characters need to be escaped in
Emacs strings.