[BUG] mail.ParseAddress() and IsEmail regex disagree

[ns-dkoblas]

Description

The regex that is used to check email addresses does not support unicode local parts. RFC 6532 allows for unicode characters in the local part of the email address, which are not supported by this regex.

For example: Muñoz@example.com

	emailRegex = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")

Steps to Reproduce

Attempt to validate any email address that has a unicode character in the local part.

Expected Behavior

I would expect that the behavior to be consistent between ParseAddress() and isEmail since they're doing the same thing.

Actual Behavior

Received error email: value must be a valid email address [string.email]

Screenshots/Logs

n/a

Environment

• Operating System:
• Version:
• Compiler/Toolchain:
• Protobuf Compiler & Version:
• Protovalidate Version: v0.14.0

Possible Solution

isEmail() should use the builtin email validation.

Additional Context

[rodaine]

Moving this to the primary protovalidate project as we need to support it globally across the ecosystem.