Regex test for email rejects correct mailbox addresses, and accepts incorrect addresses.

[gene-hightower]

The syntax for mailbox addresses used by the SMTP protocol is defined by RFC-5321. (NOT RFC-5322, as is often mistakenly thought.)

The whatwg HTML spec seems to get this wrong, see whatwg/html#4562 (comment)

For test cases please see
https://github.com/json-schema-org/JSON-Schema-Test-Suite/blob/main/tests/draft2020-12/optional/format/email.json

[gene-hightower]

For more information regarding this issue, see https://digilicious.com/mailbox-address-syntax.html