[Idna-arabicscript] Re: ZWNJ and CONTEXT

[Roozbeh Pournader]

On Tue, Apr 8, 2008 at 1:19 AM, Alireza Saleh <saleh at nic.ir> wrote:
> I just want to check the possibility if it
> could be character based regexp in the protocol ?[...] I think at
> least it is good to check all the possibilities to protect users not only at
> the registry level but at the protocol.

OK then. Still, I believe the best idea is not using regular
expressions, as the list of pairs to watch may become exhaustive: Tah
and Zah before Seen and Sheen and Beh and ... but not before Yeh and
Ain and Ghain and Heh and Alef and ... If you want to make sure the
users are safe, you should make sure you disallow or bundle-ize all
the combinations that you care about at a high level.

Cheers,
Roozbeh