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http://www.w3.org/2007/05/powder-s#
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matchesregex
http://www.w3.org/2007/05/powder-s#matchesregex
rdfs:label
http://www.w3.org/2000/01/rdf-schema#label
matches regular expression
@en
graph:default
https://triplydb.com/okfn/wdrs/graphs/default