I've just published version 10.33 of PCRE2 (Perl Compatible Regular Expressions) for z/OS.The distribution is available on file939 of the CBTTAPE.org (currently, in the 'UPDATE' page)
http://cbttape.org/ftp/updates/CBT939.zip and eventually will move to the main page (
http://cbttape.org/ftp/cbt/CBT939.zip) in few months
The distribution includes a working simple API for Rexx and a COBOL demo program that demonstrates the usage in COBOL. The Rexx API includes an Assembler program that could be used to demonstrate the usage from Assembler.
Ze'ev Atlas