GNU bug report logs - #16481
dfa.c and Rational Range Interpretation

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From: Paolo Bonzini <bonzini <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>, Aharon Robbins <arnold <at> skeeve.com>,  16481 <at> debbugs.gnu.org
Subject: bug#16481: dfa.c and Rational Range Interpretation
Date: Mon, 10 Feb 2014 09:11:21 +0100

Il 10/02/2014 03:35, Paul Eggert ha scritto:
> Paolo Bonzini wrote:
>> The correct course of action for grep is to defer range interpretation
>> to regex, because otherwise you can get mismatches between regexes with
>> backreferences and those without.
>
> It depends on what one means by "correct".  POSIX doesn't say what to do
> in this situation, so it's OK as far as POSIX is concerned for grep to
> use RRI in the typical case (i.e., without backreferences), and for grep
> to use some other interpretation in the rare cases when backreferences
> are used.
>
> The documentation for 'grep' attempts to address this issue, perhaps not
> as clearly as it could.  Maybe the installation instructions should talk
> about it as well, and suggest --with-included-regex for people who care
> about this sort of thing.

Yeah, that makes sense.  I will revert the commit.

Paolo

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