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As per html5 spec the recommended regex is:

/^[a-zA-Z0-9.!#$%&'+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)$/

This will not match addresses with non latin characters.

Addresses do not have non Latin characters.

Which is false:

Relying on standards that new for something like email would be a mistake IMO. Ymmv.

Yep, shouldn't the right answer be: accept whatever the user gave you, validate it with a link in the email you send that they've received it.

Should be even more important if you ever intend to do business with say someone from China. Good luck dealing with validating hanji in an email.

You are missing a * just before the $.