See the links to the syntax of Lucene query strings -- if that works for
you, you can use it.
Even so, if you need to both use text:query and a FILTER, then it's
probably faster because there are less triples to consider.
Andy
PS It helps to start a new thread, not reply to an existing one, when
the topic is different.
On 14/11/13 15:40, huey...@aol.com wrote:
Hi Andy,
I tried "Head*" but it does not work like "starts-with".
"Head*" matches "DICOM Header Tag", which just "Head" does not. So that behaves
as expected.
But it still does not solve my "starts-with" problem since "DICOM Header Tag" was returned as part
of the results in the first place. I only want matches like "Head Carcinoma", "Head Injury" etc.
I checked out the two links you sent before posting this question. The tutorial
mentions starts-with using the asterisk, but it matches any word in the text
that starts-with the search string which is not what I am looking for.
How do I tell the text query that it should only look for matches at the start of the
string? (like "^" in regex or strstarts).
-Wolfgang
-----Original Message-----
From: Andy Seaborne <a...@apache.org>
To: users <users@jena.apache.org>
Sent: Thu, Nov 14, 2013 3:44 pm
Subject: Re: Jena-text starts-wth
On 14/11/13 14:04, Joshua TAYLOR wrote:
On Thu, Nov 14, 2013 at 7:42 AM, <huey...@aol.com> wrote:
I am using the following query to get all concepts that start with the word
"Head".
PREFIX text: <http://jena.apache.org/text#>
PREFIX nci: <http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT *
WHERE {
?s text:query (nci:Preferred_Name 'Head') .
?s nci:Preferred_Name ?prefName .
FILTER ( regex(?prefName, "^Head", "" ))
}
Is there a way of doing that in the text query itself without having to add a
FILTER?
Maybe the Jena Lucene combination can do something without a FILTER,
but I don't know much about that, and can't help you out there. I
would point out, though, that you can make this FILTER less expensive
by using SPARQL 1.1's STRSTARTS:
filter( strstarts( str(?prefName), "Head" ))
You can use the full Lucene query syntax:
?s text:query (nci:Preferred_Name 'Head*') .
http://www.lucenetutorial.com/lucene-query-syntax.html
http://lucene.apache.org/core/4_3_0/queryparser/org/apache/lucene/queryparser/classic/package-summary.html
on the default field.
Andy
