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[bug #42501] Add -E option for FreeBSD/Mac OSX compatibility

From: James Youngman
Subject: [bug #42501] Add -E option for FreeBSD/Mac OSX compatibility
Date: Wed, 04 Jun 2014 12:45:54 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36

Update of bug #42501 (project findutils):

                Severity:              3 - Normal => 1 - Wish               
             Assigned to:                    None => jay                    


Follow-up Comment #1:

This sounds useful.   I have two questions.   The first is about the intended
behaviour of -E and the second is about the portability aspect.

1. The interpretation of posix-egrep is documented accurately in the Texinfo
manual for find (accurate because the documentation is generated automatically
from the controlling regex dialect bitmask value).    Could you check in
detail to make sure that FreeBSD's interpretation of -E really does yield the
same regex dialect?   I ask this because the only thing worse for portability
than not offering the same option is to offer the same option with very subtle
differences in behaviour...

2. If this flag is implemented you will have (at least) three versions of find
to worry about: 1. FreeBSD grep, which supports -E.   2. New versions of NGU
find, likewise.   3. Older versions of GNU find, which don't.   What is your
plan for cross-platform searching in this situation?


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