The regex() function follows more or less a Posix/Unix specification as
I was told by IBM support.

Yes. And I had to write a small testing RPGLE program, providing both the
regex string and the searched string, along with the compilation and
execution flags, from the command line and debugging it. There could I
confirm the matching I wanted. In general, shortcuts is what is mostly not
supported, for example the one I exposed earlier like "\d+" for "sequence
of one or more digits". Leads me to think this could have been just a port
of the original open source code. (?)


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