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documentation for looking-back imprecise

From: Nikolaj Schumacher
Subject: documentation for looking-back imprecise
Date: Fri, 21 Jul 2006 17:04:31 +0200

The documentation for ``looking-back'' currently says:
"limit if non-nil speeds up the search by specifying how far back the
match can start."

I've always read that as "number of characters", and only recently noticed that a buffer position is required. I think the documentation should reflect that.

Confer the ``re-search-backward'', which says:
"An optional second argument bounds the search; it is a buffer position.
The match found must start at or after that position."

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