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What is the difference between looking-at and an anchored search?

From: Lennart Borgman (gmail)
Subject: What is the difference between looking-at and an anchored search?
Date: Thu, 17 Jul 2008 13:14:13 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071031 Thunderbird/2.0.0.9 Mnenhy/0.7.5.666
looking-at does not have a BOUND parameter, but re-search-forward have. This makes re-search-forward a bit more flexible.
I am looking at some code where I would have use for that flexibility, but I wonder if there is any drawback with replacing looking-at with re-search-forward (with an achored pattern). 

Is there any? Performance?
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