The article you just mentioned in the comments includes both a completely reasonable and viable regex and binary and library alternatives that are in most languages.

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