I feel that:
EmailValidator.getInstance(true).isValid(" firstname.lastname@example.org ");
should return false, but the regex used in EmailValidator matches this string. Furthermore, the following user + domain validation is done only on "some" and "email.com", respectively. This is because the regex captures the user and domain without the space.
I know the documentation states : "This implementation is not guaranteed to catch all possible errors in an email address" but, I think this case is simple enough to be in the validator.