About: http://webisa.webdatacommons.org/428478486

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Your regex would???nt match mails from the .museum tld and probaply several others, especially in the future.
http://www.w3.org/ns/prov#wasQuotedFrom	ckers.org