RE: "International" email addresses

Validating the IDN part is much more complicated than validating the local part, because you need to know the IDN rules.  Which means it probably isn’t just a “simple” regex.

So maybe the rule should allow Unicode in the domain part and encourage complete IDN validation as an additional step?


From: [] On Behalf Of Jungshik SHIN (???)
Sent: Wednesday, November 19, 2014 10:53 AM
To: Shawn Steele
Cc: Anne van Kesteren; Steven Pemberton;; Forms WG
Subject: Re: "International" email addresses deals with it (EAI support in email form validation) although the summary is a bit misleading (it only talks about IDN).


On Wed, Nov 19, 2014 at 10:07 AM, Shawn Steele <<>> wrote:
Updating that to support EAI would be good.

-----Original Message-----
From:<> [<>] On Behalf Of Anne van Kesteren
Sent: Wednesday, November 19, 2014 2:07 AM
To: Steven Pemberton
Cc:<>; Forms WG
Subject: Re: "International" email addresses

On Wed, Nov 19, 2014 at 11:00 AM, Steven Pemberton <<>> wrote:
> So as far as I can see, an internationalised email address is:
>  address: atom-list "@" atom-list.
>  atom-list: atom ( "." atom )*
>  atom: C+
>  C: any character in the world EXCEPT (),.:;<>@[\]
> a) Do you agree?
> b) It was really hard to find this out. The internet is rife with
> people asking and getting bad answers. Please help the internet by
> being definitive.

I recommend matching HTML's definition:


Received on Wednesday, 19 November 2014 19:37:50 UTC