Splitting a url into it's component parts

Hi,

Does anyone know how to split a url into it's component parts
using TSQL?

I can separate the url into it's root and document library (this is for SharePoint)
as follows

DECLARE @url  varchar(100)
SET @url = 'http://ServerName/sites/MainSite/Subsite1/Subsite2/Shared Documents'

SELECT
 @url as url,
 LEFT(@url, LEN(@url) - CHARINDEX('/', REVERSE(@url)))as [root],
 RIGHT(@url, CHARINDEX('/', REVERSE(@url))-1) as [doclib]

But how can I determine and split the subsite names when there is a variable number
of subsites. Preferably without creating a function?

I.E
Server   Main  Sub1  Sub2 etc
http://ServerName MainSite Subsite1
http://ServerName MainSite Subsite1 Subsite2

Thanks