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Reference.org
Regular path query
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<p>In <a href="/facts/Database/VYcpkevb">databases</a> and specifically in <a href="/facts/Graph_database/WJfPlV3z">graph databases</a>, a regular path query or RPQ is a query asking for pairs of endpoints in the database that are connected by a path satisfying a certain <a href="/facts/Regular_expression/KFL3veHX">regular expression</a>. A similar feature exists in the <a href="/facts/SPARQL/XPP7pFDJ">SPARQL</a> query language as "property paths". </p>