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From: Oleksandr Gavenko <gavenko@bifit.com.ua>
Newsgroups: gmane.emacs.help
Subject: How highlight 16 or more occurrences of same character?
Date: Mon, 13 Sep 2010 11:49:28 +0300
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I use

(font-lock-add-keywords
  'c-mode
  '(
    ("\\(.\\)\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1\\1" 0 
'font-lock-warning-face t)
    ))

but don't  know how make variable back links count.