<status value="active"/> <experimental value="false"/> <date value="2014-03-26"/> <publisher value="Health Level Seven International"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org"/> </telecom> <telecom> <system value="email"/> <value value="hq@HL7.org"/> </telecom> </contact> <description value="Countries of the world. ISO 3166, part 1, alpha-2 set."/> <copyright value="This material derives from the HL7 Terminology THO. THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license"/> <compose> <include> <system value="urn:iso:std:iso:3166"/> <filter> <property value="code"/> <op value="regex"/> <value value="[A-Z]{2}"/> </filter> </include> </compose> </ValueSet>

Include codes from urn:iso:std:iso:3166 where code matches (by regex) [A-Z]{2}