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[bug #14243] Basic regular expressions does not work

From: Bob Proulx
Subject: [bug #14243] Basic regular expressions does not work
Date: Tue, 23 Aug 2005 00:01:36 -0600
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050517 Firefox/1.0.4 (Debian package 1.0.4-2)

Follow-up Comment #5, bug #14243 (project findutils):

> So I guess \{ \} are part of basic regular expressions?

No.  In basic regular expressions those would be invalid character escapes. 
So that is not a valid POSIX basic regular expression.  Because you would not
find those in a valid POSIX BRE implementations such as the GNU RE engine are
free to use them to enable the extended regular expression behavior for those
characters.  This is also true of \+ too for example.  It is a way to extend
the basic regular expressions in a way compatible with and not conflicting
with POSIX BREs.


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