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From: Juri Linkov <juri@jurta.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Interpretation of a space in regexp isearch?
Date: Thu, 30 Aug 2012 02:49:21 +0300
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Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
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> Toggling this new mode on/off should suffice for most simple searches
> where you want to search for literal SPC chars.

I agree there is less trouble toggling whitespace mode with `M-s SPC'
than applying an ugly solution to quote literal spaces with `C-q SPC'.