query: #title: Check registration number
  # Complex constraint from [[Property talk:P2632]]
  #
  SELECT ?item ?jail ?catalogue (STRLEN(?catalogue) AS ?strlen) {
    ?item p:P2632 [ps:P2632 ?jail;
                   pq:P528 ?catalogue;
                  ].
    BIND( REGEX( STR( ?catalogue ), "^((AZ\\d+)