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How (efficient) highlight occurrence of 16 same chars?

From: Oleksandr Gavenko
Subject: How (efficient) highlight occurrence of 16 same chars?
Date: Mon, 13 Sep 2010 11:13:15 +0300
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.9) Gecko/20100825 Thunderbird/3.1.3 
This code not work:

(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) 
   ))

I think back reference not worked.
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