query: SELECT ?item ?value WHERE
  {
    ?item p:P856/ps:P856 ?value .
    
    FILTER( REGEX(REPLACE(STR(?value), "%20", " "), "^(https?://(www\\.)?linkedin\\.com/in/([\\-\\&%A-Z0-9a-záâãåäăąćčçéèêěëğîıíłńñøóòôöõřśşșšțúůüýž]+)/?)$") )
  }