| http://www.w3.org/ns/prov#value | - and performing a search for category Uri and see which regular expression you thing would work best for this example. here is a sample i got from that site, of course this one is not perfect either, but it is another sample. (http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])? just know that it will probably be virtually impossible to find a perfec
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