Groups > comp.lang.javascript > #19235

Re: Restrict a domain on Email Validation

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Message-ID	<3115834.VOAWd18DUa@PointedEars.de> (permalink)
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
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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.

Thread

Restrict a domain on Email Validation GarryJones <morack@algonet.se> - 2013-04-11 10:33 -0700
  Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 20:40 +0200
    Re: Restrict a domain on Email Validation Stefan Weiss <krewecherl@gmail.com> - 2013-04-11 20:53 +0200
      Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 21:09 +0200
        Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 21:35 +0200
        Re: Restrict a domain on Email Validation Stefan Weiss <krewecherl@gmail.com> - 2013-04-11 21:49 +0200
          Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 22:04 +0200
            Re: Restrict a domain on Email Validation Stefan Weiss <krewecherl@gmail.com> - 2013-04-11 23:25 +0200
              Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-11 23:31 +0200
                Re: Restrict a domain on Email Validation Stefan Weiss <krewecherl@gmail.com> - 2013-04-12 00:23 +0200
                Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-12 00:42 +0200
                Re: Restrict a domain on Email Validation Stefan Weiss <krewecherl@gmail.com> - 2013-04-13 11:36 +0200
                Re: Restrict a domain on Email Validation Scott Sauyet <scott.sauyet@gmail.com> - 2013-04-20 13:30 -0700
    Re: Restrict a domain on Email Validation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-04-12 00:51 +0200
  Re: Restrict a domain on Email Validation Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-04-12 19:36 +0100
    Re: Restrict a domain on Email Validation "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-04-13 10:40 +0200

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