regex101: build, test, and debug regex

Tim Bray <[email protected]> Sat, 11 Feb 2023 12:00:35 -0800

Newsgroups	gmane.text.xml.devel
Message-ID	<CAHBU6iu=9vFRi1hSNmV40xOs5haskW+twEEMLRwKHOxZZyWKbQ@mail.gmail.com>

https://regex101.com/r/RUvZES/1

Also see: https://obo.sh/@bobo/109847220370139874