query: SELECT ?item ?value WHERE
  {
    ?item p:P973/ps:P973 ?value .
    
    FILTER( REGEX(REPLACE(STR(?value), "%20", " "), "^(https?://id\\.loc\\.gov/authorities/names/((n|nb|nr|no|ns|sh|gf)([4-9][0-9]|00|20[0-2][0-9])[0-9]{6}))$") )
  }