Question about weird construct

From: Diego Manilla Suárez <diego(dot)manilla(at)xeridia(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Question about weird construct
Date: 2008-11-11 08:56:15
Message-ID: 491948AF.4030804@xeridia.com
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Hi. I found this somewhere:

select a from b order by a using ~<~

I've been searching the docs but I found nothing about this weird ~<~
comparator. Not in comparison operators, String functions and operators,
nor the order by clause. Maybe it has something to do with regular
expressions, but so far I haven't found anything.

Thanks in advance.

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