@prefix pq: <http://www.wikidata.org/prop/qualifier/> .
@prefix ps: <http://www.wikidata.org/prop/statement/> .
@prefix wds: <http://www.wikidata.org/entity/statement/> .
@prefix wikibase: <http://wikiba.se/ontology#> .

wds:P13568-9e299d54-42e5-c9bd-b58f-e6cef183264c a wikibase:BestRank ;
    wikibase:rank wikibase:NormalRank ;
    pq:P13337 "substack.com" ;
    ps:P8966 "^https?:\\/\\/substack\\.com\\/@([A-Za-z\\d]{4,32})" .