How Can I execute SPARQL queries containing '$' character using ISQL? Assuming a SPARQL query should filter on the length of labels: SELECT ?label FROM <http://mygraph.com> WHERE { ?s ?p ?label FILTER(regex(str(?label), "^.{1,256}$") ) } View the results of the query execution on the LOD instance. ISQL uses '$' character as a prefix for macro names of its preprocessor. When '$' character is used in SPARQL query to be executed in ISQL, the character should be replaced with '$$' notation or an escape char + numeric code: SQL> SPARQL SELECT ?label FROM <http://mygraph.com> WHERE { ?s ?p ?label FILTER(REGEX(str(?label), "^.{1,256}$$") ) } View the results of the query execution on the LOD instance. Note also that the FILTER written in this way, finds ?label-s with length less than 256. To achieve fast results, REGEX should be replaced with the bif:length function: SQL> SPARQL SELECT ?label FROM <http://mygraph.com> WHERE { ?s ?p ?label FILTER (bif:length(str(?label))<= 256) } In this way the SPARQL query execution can work much faster if the interoperability is not required and ?label-s are numerous. View the results of the query execution on the LOD instance. Related Virtuoso Tips and Tricks Collection RDF Data Access and Data Management