query: SELECT ?item ?value WHERE
  {
    ?item p:P973/ps:P973 ?value .
    
    FILTER( REGEX(REPLACE(STR(?value), "%20", " "), "^(https?://www\\.pss-archi\\.eu/immeubles/([A-Z]{2&#125;-\\d+-[1-9]\\d*)\\.html)$") )
  }