Hi Jason,
No such bif:match function exists in Virtuoso ...
You should be able to use a filter clause in conjunction with bif:contains to
get a performant exact match with something like:
select * where {?s ?p ?o . ?o bif:contains '"Nevis"' FILTER
(?o="Nevis"@en)}
See the following live example against DBpedia:
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&qtxt=select+*+where+%7B%3Fs+%3Fp+%3Fo+.+%3Fo+bif%3Acontains++%27%22Nevis%22%27+FILTER+%28%3Fo%3D%22Nevis%22%40en%29%7D&format=text%2Fhtml&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=30000&debug=on&run=+Run+Query+
<http://dbpedia.org/sparql?default-graph-uri=http://dbpedia.org&qtxt=select+*+where+{?s+?p+?o+.+?o+bif:contains++%27%22Nevis%22%27+FILTER+(?o=%22Nevis%22@en)}&format=text/html&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=30000&debug=on&run=+Run+Query+>
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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> On 12 Feb 2018, at 22:05, Jason Koh <jb...@eng.ucsd.edu> wrote:
>
> Hi,
>
> I would like to optimize objects of ``?s base:name ?o`` and previously
> suggested to use bif:contains. However, as the query needs to be exact
> matching, I wonder if there is a function like bif:match. (It looks like none
> but would like to learn the reasoning.)
>
> Regex must work but I found that it does not use the same index as contains.
>
> Thanks!
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
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