Re: Odd behavior with LIKE?

Sometimes you just miss things. That's the problem with not being perfect
:-)

Tim

----- Original Message -----
From: "Joseph Shraibman" <jks@selectacast.net>
To: "Tim Barnard" <tbarnard@povn.com>
Sent: Monday, June 11, 2001 2:45 PM
Subject: Re: [GENERAL] Odd behavior with LIKE?


> How could you miss that?  Those are the things that make LIKE different
> from =
>
> Tim Barnard wrote:
> >
> > Thanks. Somehow I missed that :-(
> >
> > Tim
> >
> > ----- Original Message -----
> > From: "GH" <grasshacker@over-yonder.net>
> > To: "Tim Barnard" <tbarnard@povn.com>
> > Cc: <pgsql-general@postgresql.org>
> > Sent: Monday, June 11, 2001 12:23 PM
> > Subject: Re: [GENERAL] Odd behavior with LIKE?
> >
> > > On Mon, Jun 11, 2001 at 11:00:36AM -0700, some SMTP stream spewed
forth:
> > > > I've noticed that if I don't preceed an underscore character ( _ )
> > > > with a double backslash ( \\ ), then a select using LIKE
> > > > ignores the underscore. For example, I have a couple of indexes
> > > > that end with "_ts" and a few tables that end in "ts":
> > >
> > > Quote
/usrs-lounge/docs/7.1/user/functions-matching.html#FUNCTIONS-LIKE
> > > ...
> > > An underscore (_) in pattern stands for (matches) any single
character; a
> > > percent sign (%) matches any string of zero or more characters.
> > > ...
> > > 'abc' LIKE '_b_'    true
> > >
> > > > select relname from pg_class where relname not like 'pg\\_%' and
relname
> > not like '%\\_pkey' and relname not like '\\_ts';
> > > >
> > > > Question is: Why must the underscore character
> > > > be prefixed with a double-backslash?
> > >
> > > It must be escaped because it a special pattern-matching character.
> > >
> > >
> > > gh
> > >
> > > > Tim
> > > >
> > >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 4: Don't 'kill -9' the postmaster
>
> --
> Joseph Shraibman
> jks@selectacast.net
> Increase signal to noise ratio.  http://www.targabot.com
>