[Feature request]Validation String extension about dartx HOT 5 OPEN

We should avoid adding too many extensions on String. Strings are widely used and most don't represent a phone number or an email address.

For such cases I suggest creating new packages, like an email validator which could also contain validation logic.

final String mailAddress = json["email"] as String;
final EmailAddress email = EmailAddress.tryParse(mailAddress);
if (email != null) {
  print("Email is valid");
}

Side note: Email validation is as tricky as phone number validation. Probably impossible to cover in a single regex. I'd be happy if there is a package with like 100 tests for it 😉

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@shinriyo Phone numbers are super complicated to validate. I think this should be a separate package (see github.com/google/libphonenumber)

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@shinriyo I like the idea. What else could we validate? Emails, URLs, ...

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@leisim both of them.
and telephone numbers also

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@leisim Thank you. I checked the URL's contents. but, there are not dart languages though it is google official language.

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