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GNU and BSD sed differences

From: Werner LEMBERG
Subject: GNU and BSD sed differences
Date: Mon, 12 Dec 2005 08:12:38 +0100 (CET)

I suggest to add that `\?', `\+', and `\|' should not be used in sed
expressions because other sed implementations don't interpret those
entities specially.  Inspite of marked as GNU extensions in sed.info,
it is easy to miss that.


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