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From: Eli Zaretskii <eliz@fencepost.gnu.org>
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Subject: Re: user sees \xxx but is thwarted from searching for them
Date: Tue, 16 Apr 2002 14:19:21 -0400
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> From: Heinrich Rommerskirchen <Heinrich.Rommerskirchen@icn.siemen.de>
> Newsgroups: gnu.emacs.bug
> Date: 16 Apr 2002 14:41:02 +0000
> 
> "Eli Zaretskii" <eliz@is.elta.co.il> writes:
> 
> > Try "C-u C-x =", it should tell.
> 
> But you have to do it for each candidate character. Or is there some easy
> way to search for the next latin-9 character in a predominantly latin-1
> buffer?

I'm not aware of a command to do that (but that might because I never
bumped into it, not because it doesn't exist).  If indeed there is
none, you should be able to write something like this using the
functions char-charset and find-charset-region.