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Re: Email Validation Problem

Newsgroups comp.lang.javascript
Date 2013-01-25 13:53 -0800
References <amb6f9Fhvk3U1@mid.individual.net> <kdr1j6$9gu$1@speranza.aioe.org> <amd3neF83mU1@mid.individual.net>
Message-ID <583146fb-feda-477e-8bc7-d710ab6a5744@googlegroups.com> (permalink)
Subject Re: Email Validation Problem
From Luc Yen <luc@goal.tw>

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Mel Smith於 2013年1月24日星期四UTC+8下午11時53分06秒寫道：
> To all responders:
> 
> 
> 
>     I'll examine and work on your suggestions and test them and see if they 
> 
> can handle the cases I've noted and those other cases where 'true' was 
> 
> returned -- but should not have been.
> 
> 
> 
>     I'm wondering if there is a possibility of a common (for our JavaScript 
> 
> ng)  regex solution for email validation, that we can all use for our work ?
> 
> 
> 
>     I've also heard mentioned  of a function called (I believe) checkdnsrr() 
> 
> which is used by server software to do more thorough checks of a suspect 
> 
> email address.  Is this 'function' available as a download or C source that 
> 
> can be compiled (I have several C compilers on my machine).
> 
> 
> 
>     Thank to y'all.
> 
> 
> 
> -Mel Smith

No general rule. Client side script is used for checking well-formedness and minimizing round-trip to server. Validation is another issue.
Sometimes you need to add [\uxxxx-\uxxxx] character class or add plenty of TLDs to cover your user space. Keep it simple, don't block your user, and do something better than just checking '@' and '.'

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Thread

Email Vali8dation Problem "Mel Smith" <med_cutout_syntel@aol.com> - 2013-01-23 15:27 -0700
  Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-24 01:18 +0100
    Re: Email Vali8dation Problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-01-24 02:06 +0100
      Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-24 22:30 +0100
        Re: Email Vali8dation Problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-01-24 22:38 +0100
    Re: Email Vali8dation Problem Jeff North <jnorthau@yahoo.com.au> - 2013-01-24 13:04 +1100
      Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-24 22:24 +0100
        Re: Email Vali8dation Problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-01-24 22:40 +0100
        Re: Email Vali8dation Problem Jeff North <jnorthau@yahoo.com.au> - 2013-01-26 00:12 +1100
          Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-25 21:56 +0100
            Re: Email Vali8dation Problem Jeff North <jnorthau@yahoo.com.au> - 2013-01-26 10:56 +1100
              Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-26 01:56 +0100
                Re: Email Vali8dation Problem Jeff North <jnorthau@yahoo.com.au> - 2013-01-26 20:14 +1100
                Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-26 13:21 +0100
                Re: Email Vali8dation Problem Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2013-01-26 15:07 +0200
                Re: Email Vali8dation Problem "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-01-26 16:04 +0200
                Re: Email Vali8dation Problem Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2013-01-26 16:37 +0200
                Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-26 15:46 +0100
                Re: Email Vali8dation Problem Jeff North <jnorthau@yahoo.com.au> - 2013-01-27 10:30 +1100
  Re: Email Vali8dation Problem Andreas Bergmaier <andber93@web.de> - 2013-01-24 01:58 +0100
    Re: Email Vali8dation Problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-01-24 02:08 +0100
    Re: Email Vali8dation Problem "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-01-24 10:25 +0100
  Re: Email Vali8dation Problem Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-01-24 11:15 +0100
    Re: Email Validation Problem "Mel Smith" <med_cutout_syntel@aol.com> - 2013-01-24 08:53 -0700
      Re: Email Validation Problem Luc Yen <luc@goal.tw> - 2013-01-25 13:53 -0800
  Re: Email Vali8dation Problem Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-01-24 19:59 +0000
    Re: Email Vali8dation Problem "Mel Smith" <med_cutout_syntel@aol.com> - 2013-01-25 09:37 -0700
      Re: Email Vali8dation Problem Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-01-25 22:08 +0100
        Re: Email Vali8dation Problem Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-01-26 20:51 +0000

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