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Message-ID: <3115834.VOAWd18DUa@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 11 Apr 2013 22:04:56 +0200
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Subject: Re: Restrict a domain on Email Validation
Newsgroups: comp.lang.javascript
References: <9e42c475-f0f4-4822-98d4-0291745f3447@googlegroups.com> <7867864.kBbL0iy7tU@PointedEars.de> <kk70s5$rdc$1@news.albasani.net> <2615387.eNcf81pqbo@PointedEars.de> <kk743r$2vr$1@news.albasani.net>
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Stefan Weiss wrote:

> On 2013-04-11 21:09, Thomas 'PointedEars' Lahn wrote:
>> Stefan Weiss wrote:
>>> On 2013-04-11 20:40, Thomas 'PointedEars' Lahn wrote:
>>>> 
>>>>   && !/@forbidden\.[^.]+$/.test(…)
> ...
>>> That pattern won't match "@forbidden.co.uk".
>> 
>> Correct.  Use
>> 
>>   …
>>   && !/@forbidden(\.[^.]+)+$/.test(…)
>> 
>> or
>> 
>>   …
>>   && !/@forbidden(\..+?)+$/.test(…)
> 
> Okay, but that also matches "@forbidden.planet.example.com".

So?

> In conjunction with the OP's original regex, looking for the substring
> "@forbidden." would do the same thing.

No, (!x && !y) is logically equivalent to !(x || y).

> I don't see any simple and correct general solution for this with a
> single regular expression, unless we want to enumerate all currently
> known top level domains and their associated reserved second level
> domains. Which, by the way, is going to be quite a task soon, because
> about 2000 new TLDs are expected to be assigned this year.

Maybe you are just thinking about a different problem.

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.