XSLT for port splitting

Hi Stasinos, 
 
 Here is a sample XSLT showing how to split a whitespace separated list
of ports into a number of XSD Datatypes, either constrained to a single
value or range. I hope it is still relevant given this morning's emails!
Please could you confirm exactly what I  need to do with the 'Rabin
Regex', since the candidate URI is not available to the XSLT...?

	 
	Cheers
	Kevin