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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: How highlight 16 or more occurrences of same character?
Date: Mon, 13 Sep 2010 12:32:37 +0200
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>    ("\\(.\\)\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1"

You should be able to use "\\(.\\)\\1\\{15\\}"


        Stefan