Validator email - Not allowing international email (RFC 6531)

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request

Current behavior

Using Validator.email with an international email (UTF-8 in the local part) is claiming that the email is invalid.

Expected behavior

Validator.email should accept valid emails as RFC 6531 suposes.

Minimal reproduction of the problem with instructions

1. Create a basic form with a field including Validator.email
2. Put an international email address like mü[e-mail] into the email field
3. Check validation

Example: https://stackblitz.com/edit/angular-gitter-cn98xo

What is the motivation / use case for changing the behavior?

The world is not just ASCII or english speaking, so emails with valid UTF-8 parts should work as well. Even hotmail is allowing international local parts like umlauts.

Environment

Angular version: 6.0.7, 6.1.0
Browsers: Irelevant, it is a regex issue
For Tooling issues:
- Node version: 8.9.4+
- Platform:  Any

[Swissbite]

We have the use case and customers with such emails, so yes: Even if it may not yet be in the WHATWG, it makes sense. I know I could just use another regex validator, but in my opinion it would make sense to adjust the validator that it matches the real world.

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