[whatwg] Make "foo at bar.com, " a valid email address list
Alex Bishop
alexbishop at gmail.com
Sun Oct 24 10:05:26 PDT 2010
On 23/10/2010 22:16, Garrett Smith wrote:
> On 10/22/10, Anne van Kesteren <annevk at opera.com> wrote:
>> On Fri, 22 Oct 2010 19:44:42 +0200, Boris Zbarsky <bzbarsky at mit.edu> wrote:
>>> On 10/22/10 1:25 PM, Garrett Smith wrote:
>>>> What is wrong with splitting on comma, e.g.
>>>>
>>>> var validAddressList = inp.value.split(",");
>>>
>>> That depends on what meaning of "email address" is used here. Is:
>>>
>>> "Zbarsky, Boris" <bzbarsky at mit.edu>
>>>
>>> a valid "email address"?
>>
>> Not per HTML5.
>>
>
> Link:
> http://www.w3.org/TR/2010/WD-html-markup-20101019/input.email.html
>
> Quote:
> A single e-mail address.
> Any string that matches the following [ABNF] production:
>
> 1*( atext / "." ) "@" ldh-str 1*( "." ldh-str )
>
> …where atext is as defined in [RFC 5322], and ldh-str is as
> defined in [RFC 1034].
Definition of atext from RFC 5322:
> atext = ALPHA / DIGIT / ; Printable US-ASCII
> "!" / "#" / ; characters not including
> "$" / "%" / ; specials. Used for atoms.
> "&" / "'" /
> "*" / "+" /
> "-" / "/" /
> "=" / "?" /
> "^" / "_" /
> "`" / "{" /
> "|" / "}" /
> "~"
ALPHA and DIGIT are themselves defined in RFC 5234 to be the letters A
to Z (upper-case or lower-case) and the digits 0 to 9 respectively.
Definition of ldh-str from RFC 1034:
> <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
>
> <let-dig-hyp> ::= <let-dig> | "-"
>
> <let-dig> ::= <letter> | <digit>
>
> <letter> ::= any one of the 52 alphabetic characters A through Z in
> upper case and a through z in lower case
>
> <digit> ::= any one of the ten digits 0 through 9
In other words, the letters A to Z (upper-case or lower-case), the
digits 0 to 9 and the hyphen.
Therefore
"Zbarsky, Boris" <bzbarsky at mit.edu>
is not a valid email address because the portion before the @ contains
characters that are not atext (namely, the quotation marks, the comma,
the spaces and the left angle bracket) or dots, and the portion after
the @ contains characters that are not ldh-str or dots (namely, the
right angle bracket).
bzbarsky at mit.edu is, however, a valid email address.
Alex
--
Alex Bishop
alexbishop at gmail.com
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