[18:05:32] <JAA>	 I'm trying to find items with a P856 (official website) containing a certain string. What's wrong with this SPARQL query? `SELECT ?item ?website WHERE { ?item wdt:P856 ?website . FILTER CONTAINS(?website, "wikipedia") . }`  Does it have something to do with the data type of P856 being URL, not simply a string?
[18:20:03] <JAA>	 Ah, found something on WD:Request_a_query. Yes, it does. `CONTAINS(str(?website), "wikipedia")` works. :-)
[18:22:00] <JAA>	 For future reference: https://www.wikidata.org/wiki/Wikidata:Request_a_query/Archive/2022/07#Item_from_website_URL