How to use FILTER REGEX in RDFLib?

[Kristina]

I wanted to use the RDFLib for SPARQL 1.1 Queries which should be supported.
I have a file in JSON-LD and simple SELECT query works fine. But when I add a FILTER REGEX, the result is zero size and also no error.
Here is my code (abstracted):

g = Graph()
g.parse("myontology.owl", format="json-ld")
result = g.query(
"""SELECT ?func
WHERE { ?func rdf:type mo:Function .
FILTER REGEX (?func, "off", "i").}""",
initNs={"mo": "http://mynamespace#"})
for row in result:
print("%s " % row)

What is wrong with the FILTER REGEX?
I didn't find a good documentation how to use SPARQL Algebra in RDFLib.
Thank you for help!

[Gunnar Aastrand Grimnes]

regex is not defined on URIs - you have to cast it to a string:

FILTER REGEX(str(?func), "off", "i") should work

- Gunnar

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[Kristina]

Am Donnerstag, 20. September 2018 12:28:57 UTC+2 schrieb Gunnar Aastrand Grimnes:
> regex is not defined on URIs - you have to cast it to a string:
>
> FILTER REGEX(str(?func), "off", "i") should work
>
> - Gunnar

It works. Thank you very much!