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From: Juri Linkov <juri@jurta.org>
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Subject: Re: Interpretation of a space in regexp isearch?
Date: Wed, 29 Aug 2012 11:38:03 +0300
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> But let's not sacrifice some char (e.g. nobreak-space), so that its
> use in a search string means something special, not searching for itself.

The space character is special to indicate whitespace.
We need another special character to indicate literal space
in non-regexp searches.  Could you find a better character
than nobreak-space?