Groups > comp.lang.javascript > #19237

Re: Restrict a domain on Email Validation

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Message-ID	<1934436.yJr0pKV1Qq@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 23:31:11 +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 22:04, Thomas 'PointedEars' Lahn wrote:
>> 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?
> 
> So it doesn't solve the problem as stated:
> 
> | block all email addresses from @forbidden.*
> | (Where * can be org, com. co.uk, se ...... etc)
> 
> forbidden.planet.example.com is clearly a false positive.

Your logic is flawed.  “...... etc” makes it clear that *any* domain name 
whose bottom level is named “forbidden” is to be rejected, including 
forbidden.planet.example.com.

>>> 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).
> 
> You're contradicting an imaginary statement - I never even mentioned any
> operators. To be clear, for the purpose of testing if the domain name
> part "forbidden" follows the @-sign,
> 
>    if (!(/original-regex/.test(str) && !/your-regex/.test(str)))
> 
> is equivalent to
> 
>    if (!(/original-regex/.test(str) && str.indexOf("@forbidden.") < 0))
> 
> or, with the negated parenthesized expression resolved,
> 
>    if (!/original-regex/.test(str) || str.indexOf("@forbidden.") > -1)

No, it is not.  Your logic is flawed.
 
> The point is that none of these really solve the OP's problem
> (but they might be sufficient for his purposes, anyway).

The expression that I posted does solve the OP's problem; you have just 
misunderstood the 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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