使用Jena，FILTER和REGEX编写SPARQL查询

Question

I wrote I SPARQL query with JENA with the REGEX : /^name$/i (Actually name is a String variable that could be any value, with spaces or not, it's received as a parameter of the method).

Here's the String query:

String authorquery = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> " +
                "PREFIX dc: <http://purl.org/dc/elements/1.1/> " +
                "PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT " +
                "?URIAutor WHERE { " +
                "?URIAutor foaf:name ?Autor." + 
                "FILTER (regex(?Autor, \"" + "/^" + name + "$/" + "\", 'i' )  ).}";

That isn't giving me an exception, but isn't returning me results when I write a name that I'm sure is on the Database. That's what I want with this query: I have the name "Agatha Christie" on the database. If name=Agatha I would like the query to return nothing. I'd like it only to return me the URI from the author named "Agatha Christie" if name="Agatha Christie"(can be case insentive). The same holds for the names "Bill Clinton" and "Bill Gates", if name=Bill I wouldn't like to find both URIs, but the query should return no results. The result should come for "Bill Clinton" only if name="Bill Clinton" .

I don't know if the problem is with the REGEX or with turning the REGEX into a String with a variable in the middle.

Could you help me?

Answer 1

Don't put /.../ around the regex string. ^name$ will do.