Subject: Re: Postgres regexp matching failure?
From: Mario Splivalo <mario.splivalo@mobart.hr>
Reply-To: mario.splivalo@mobart.hr
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: pgsql-sql@postgresql.org
In-Reply-To: <20060905142115.GC21195@alvh.no-ip.org>
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Content-Type: text/plain
Organization: Mob-Art
Date: Tue, 05 Sep 2006 17:03:53 +0200
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On Tue, 2006-09-05 at 10:21 -0400, Alvaro Herrera wrote:
> Mario Splivalo wrote:
> > On Tue, 2006-09-05 at 08:42 -0500, Aaron Bono wrote:
> > > On 9/5/06, Mario Splivalo <mario.splivalo@mobart.hr> wrote:
> > >         
> > >         pulitzer2=# select 'stop works' ~ '^\s*(?:[\
> > >         +|-]|(?:[sS][tT][oO][pP]\b)).*$';
> > >         ?column?
> > >         ----------
> > >         f
> > >         (1 row)
> > >         
> > >         Here, postgres should return true, but it gives me false.
> > > 
> > >  
> > > \b is a back-space - is that what you are wanting there?  If I remove
> > > it I get true.
> > 
> > Actually, I'm not sure :) As I've mentioned, python/java/perl do as I
> > expected, postgres on the other hand doesn't. If \b was the backspace,
> > then I'd have trouble with '+mario test', and that one seems to be OK. 
> 
> No, because the \b is inside the "stop" arm of the |.  You need to do
> *both*, double backslashes and get rid of \b (or at least understand
> what you actually mean with it ...)
> 

I know this might not be the right place for this question, but, how
come (or better: why?) is above regexp macthed ok (ok as in 'the way I
expected') when employed from java/perl/python?

	Mario