From: Jeff Boes <jboes@nexcerpt.com>
Subject: Re: "reverse()" on strings
Date: Mon, 26 Aug 2002 16:56:46 -0400
Organization: Nexcerpt, Inc.
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References: <no.Yo.N.nN.0208261600250.2291-100000@business.com>
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To: pgsql-sql@postgresql.org

On Mon, 26 Aug 2002 16:13:44 -0400, h012 wrote:


>  CREATE INDEX extension_idx ON file (reverse(name));
> -- but I didn't find a function called "reverse"
> 
>  CREATE INDEX extension_idx ON file (regex_match( '.*(\.[^\.]*)$' );
> -- but I didn't find a function called "regex_match" which would return
> string matched in brackets ()
> 

You probably want to do a

$ createlang plperl

and then something like this:

CREATE FUNCTION fn_strrev(text) returns text as '
return reverse($_[0])
' language 'plperl' with (iscachable);

The same approach can be used to provide a regex match with Perl syntax,
but I don't have an example of that coded up and at hand.


-- 
Jeff Boes                                      vox 269.226.9550 ext 24
Database Engineer                                     fax 269.349.9076
Nexcerpt, Inc.                                 http://www.nexcerpt.com
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