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Message-ID: <2615387.eNcf81pqbo@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 21:09:36 +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>
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Stefan Weiss wrote:

> On 2013-04-11 20:40, Thomas 'PointedEars' Lahn wrote:
>> GarryJones wrote:
>>> How can I change the script to block all email addresses from
>>> @forbidden.*
>> 
>>   …
>>   && !/@forbidden\.[^.]+$/.test(…)
> ...
>>> (Where * can be org, com. co.uk, se ...... etc)
> 
> That pattern won't match "@forbidden.co.uk".

Correct.  Use

  …
  && !/@forbidden(\.[^.]+)+$/.test(…)

or 

  …
  && !/@forbidden(\..+?)+$/.test(…)

then (the former is backwards-compatible and presumably more efficient than 
the latter).  You may also want to insert “\s*” before “$” to account for 
trailing whitespace.  The RegExp constructor comes in handy here with regard 
to an easily maintained list of allowed characters (which reminds me to look 
into pattern interpolation for jsx.regexp.RegExp).

In any case, the expression appropriate for this task can be derived from 
RFC 5322, section 3.4.1.  (I have pos[i]ted the approach before, but I do 
not know the Message-ID.)

-- 
PointedEars

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