add asMailString()

[RodrigoDornelles]

Is your feature request related to a problem? Please describe.
is something interesting, there is an email validation when string, I would liken [...]

Describe the solution you'd like
do a regex validation over email, someone can refine it in the future and check IDN and DNS

Additional context

const email = env.get('MAIL_USER').asMailString();

[evanshortiss]

@RodrigoDornelles this is a good suggestion. I've had to do this before, though I was lazy and used asString().

The one issue with this is how strict the implementation is. There are a few good suggestions in this StackOverflow post and this one too.

Personally I would accept a PR that does a simple regex, then mention this in the module docs. Aiming for full RFC compliance is not necessary since it would require using a third party module like this one or potentially complex code.

Do you want to open a PR?

[RodrigoDornelles]

i think so, i'm not very familiar with regex and am typescript's noob, but i'll try anyway... carefully review my PR!

[bigen1925]

Hi guys,

Thank you for providing this simple and awesome library, I love this. :D

And I will be also happy if this feature will be implemented, but there seems to be no progress in months, so I opened a PR.

#158

I'm happy to be reviewed.

[evanshortiss]

Released this in version 7.2.0. Thank you all.