E-mail validation #12
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A common thing to validate in a (web) application are e-mail addresses. However, they are notoriously difficult to correctly validate, because e-mail addresses are complicated and there are lots of rules and exceptions.
For the email validator in this library, we have chosen the WHATWG HTML living standard as a reference. Hence the validator uses a regex that comes from the WHATWG HTML spec document:
https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address
We implement a bunch of unit tests in ValidationKit to demonstrate cases of valid and invalid email addresses.