How Can I Use MODIFY to update triples? The following queries are equivalent: MODIFY <http://test.com/> DELETE {?s ?p ?o} INSERT {?s_new ?p ?o} FROM <http://test.com/> WHERE { { SELECT iri(bif:replace(str(?s),"http://test.com/link","http://test.com/extra/link" ) ) AS ?s_new ?s ?p ?o WHERE { ?s ?p ?o FILTER (regex (str(?s), "http://test.com/link")) } } } MODIFY <http://test.com/> DELETE {?s ?p ?o} INSERT {`iri(?s_new)` ?p ?o} FROM <http://test.com/> WHERE { { SELECT bif:replace(str(?s),"http://test.com/link","http://test.com/extra/link" ) AS ?s_new ?s ?p ?o WHERE { ?s ?p ?o FILTER (regex (str(?s), "http://test.com/link")) } } } MODIFY <http://test.com/> DELETE {?s ?p ?o} INSERT { `iri(bif:replace(str(?s),"http://test.com/link","http://test.com/extra/link" ))` ?p ?o } FROM <http://test.com/> WHERE { { ?s ?p ?o FILTER (regex (str(?s), "http://test.com/link")) } } } Related Virtuoso Tips and Tricks Collection Virtuoso Documentation