Date: Wed, 19 Jan 2011 08:18:38 -0600
From: Kenneth Marshall <ktm@rice.edu>
To: Stephen Belcher <sycobuny@malkier.net>
Cc: Samuel Gendler <sgendler@ideasculptor.com>,
	andrew1 <andrew1@mytrashmail.com>, pgsql-sql@postgresql.org
Subject: Re: question about reg. expression
Message-ID: <20110119141838.GJ6475@aart.is.rice.edu>
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On Wed, Jan 19, 2011 at 08:17:50AM -0500, Stephen Belcher wrote:
> Another way to match multiple occurrences is to use curly brackets with a
> number, like:
> select 'ab' ~ '^[a-z]{2}$';
> 
> It can be done with a range of numbers as well:
> select 'ab' ~ '^[a-z]{2,4}$';
> select 'abab' ~ '^[a-z]{2,4}$';
> 
> I believe, however, that the curly brackets notation was introduced in 9.0
> and is not available in earlier versions.
> 
> --Stephen
> 

That is not so. POSIX regular expressions, including the curly backet
notation, are available in all current supported releases of PostgreSQL:

http://www.postgresql.org/docs/8.2/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP

I did not bother to check our local documentation for earlier releases
as to how much earlier such support was available.

Cheers,
Ken