[whatwg] Comments on the definition of a valid e-mail address

[TAMURA, Kent]

FYI.
I was in Gmail team and wrote the email address validation code which we are
currently using.
Gmail's validation rules are:
  - require "@"
  - local-part should be
    - quoted-string without CFWS and FWS, or
    - 1*(atext / ".")    This means dot-atom-text without "." restriction.
This looseness was introduced for Japanese cell phone addresses.
  - domain-part should be [a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+
     It requires at least 1 dot.  The last non-dot sequence should have at
least 2 characters.

I have never heard requests to support for non-ASCII characters other than
IDN.

-- 
TAMURA Kent
Software Engineer, Google



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