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From: Sam Steingold <sds AT gnu DOT org>
Subject: Re: cygwin/regex is non-POSIX
Date: Tue, 20 Jan 2004 16:35:37 -0500
Organization: disorganization
Lines: 31
Message-ID: <u1xpupal2.fsf@gnu.org>
References: <uhdyxm0ji DOT fsf AT gnu DOT org> <20040118050449 DOT GA3672 AT efn DOT org> <uoeszrcq9 DOT fsf AT gnu DOT org> <20040119201357 DOT GA2608 AT efn DOT org> <uisj7r53z DOT fsf AT gnu DOT org> <20040120194127 DOT GA3880 AT efn DOT org>
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> * Yitzchak Scott-Thoennes <fgubraan AT rsa DOT bet> [2004-01-20 11:41:27 -0800]:
> On Mon, Jan 19, 2004 at 04:38:40PM -0500, Sam Steingold <sds AT gnu DOT org> wrote:
>> >> Finally, a common extension appears to be the use or "?" after a
>> >> repetition specification to mean non-greedy matching, e.g.
>> >> "a+?" will match only the first "a" in "aaaa".
>> > You want the pcre packages then (pcre and pcre-devel).
>> no, not really.
> Care to say why?

My interest in regular expressions is limited to maintaining CLISP
regexp & pcre modules:
<http://clisp.cons.org/impnotes/modules.html#pcre>
<http://clisp.cons.org/impnotes/modules.html#regexp>
this specific issue was motivated by my attempt to adopt a regexp
testsuite
<http://cvs.sourceforge.net/viewcvs.py/*checkout*/clisp/clisp/modules/regexp/test.tst>
(comments welcome - not here but on
<http://lists.sourceforge.net/lists/listinfo/clisp-list>)


Could you (or anyone else) explain to me the rationale behind BREs
supporting back-refs and EREs not supporting them?
This is very counterintuitive.
I don't think this is directly relevant to cygwin,
so private e-mail is welcome.

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.honestreporting.com>
If you think big enough, you'll never have to do it.


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