The regexes are written to comply with RFC 5332 and 6854

They are well defined and you can absolutely definitively check whether an address is allowable or not.

https://datatracker.ietf.org/doc/html/rfc5322

worst thing is, the regex to check email has been available for decades and it’s fine with apostrophies

The directions specifically lead through using a docker host and an elastic search host, But there’s certainly no reason you couldn’t just do that on your own.