query: PREFIX wikibase: <http://wikiba.se/ontology#>
  PREFIX wd: <http://www.wikidata.org/entity/> 
  PREFIX wdt: <http://www.wikidata.org/prop/direct/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  
  SELECT (count(?item) as ?cnt) {
    ?item rdfs:label ?label .
    filter (lang(?label) = "en") .
    filter regex(?label, '^.+?\\([a-z1-9]\\)', 'i')
  }
  limit 10