To: "Paul Lambert" <paul.lambert@autoledgers.com.au>
Cc: "sql pgsql" <pgsql-sql@postgresql.org>
Subject: Re: Extracting hostname from URI column
In-Reply-To: <46EDB43D.9060405@autoledgers.com.au> (Paul Lambert's message of
	"Mon\, 17 Sep 2007 06\:54\:53 +0800")
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	<46E73D1C.4020009@autoledgers.com.au>
	<46EDB43D.9060405@autoledgers.com.au>
From: Gregory Stark <stark@enterprisedb.com>
Organization: EnterpriseDB
Date: Mon, 17 Sep 2007 00:18:56 +0100
Message-ID: <873axekxlr.fsf@oxford.xeocode.com>
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"Paul Lambert" <paul.lambert@autoledgers.com.au> writes:

> What would be the best way to do something like that? I assume it won't be a
> simple regex like the above due to the country codes on the end of some
> domains. My thought is look at the last portion of the domain, if it's 2
> characters long then assume it's a country code and grab the last three
> sections, if it's not three characters long then assume it's an international
> domain and grab the last two... but that sounds a bit dodgy.

Not all countries break up their national tld space into sections like .co.uk
or .com.au. Canadian domains can be bought directly under .ca like amazon.ca.

I think you'll have to store a specific list of tlds and how deep you want to
look.

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com