[Rdfapi-php-interest] [Fwd: [jena-dev] regular expressions in RDQL?]

[Richard C. <ric...@hp...>]

FYI: As someone pointed out on jena-dev, regular expressions are written
like this in Jena's RDQL implementation:

AND ?x =~ /regex/

In RAP's implementation, it would be (according to the tutorial):

AND ?x =~ "/regex/"

I don't think anything has to be done about it, but you should be aware
of the issue.

Richard



-------- Forwarded Message --------
From: abelssoft <Ne...@ab...>
Reply-To: jen...@ya...
To: jen...@ya...
Subject: [jena-dev] regular expressions in RDQL?
Date: Fri, 27 May 2005 12:41:33 -0000
Hi guys,

we wanted to use the ~~ or =~ in an RDQL for using regular expressions.

Logically, I would assume that we need to write something like this:

 SELECT ?id
 WHERE (?x, <ns:id>, ?id)
...
 AND ?name ~~ "demoname"
 USING ns for <http://www.test.com/test#>

However: In my Java-Implementation, Jena said that we should remove
the quotes and so does your tutorial at
http://jena.sourceforge.net/tutorial/RDQL/index.html

However: In all other cases, Strings are used WITH quotes and if we
remove the quotes then how do we use white spaces???

In the W3C-website at http://www.w3.org/Submission/RDQL/#prod25
it sais:
STR_MATCH  	         ::=   	'=~' | '~~'
StringEqualityExpression ::= ...<STR_MATCH> PatternLiteral ...
PatternLiteral 	         ::=  	
(nothing on the left side) :-(


Furthermore, there is another API for rdql that uses quotes:
http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/tutorial/rdql_tutorial.htm

So what is correct?



Best greetings,

Sven




 
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