Rails - Mar 2010 - Is there a rails way to validate format of an email address?

How can I validate and email address without using complex reg-ex is 
there a simple rails way to do this?


-- 
Kind Regards,
Rajinder Yadav

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Rajinder Yadav wrote:
> How can I validate and email address without using complex reg-ex is
> there a simple rails way to do this?
Are you nuts? That''s just the sort of thing Regexp was designed to do. 
And, it''s not really all that complex. The Rails docs even use email 
validation as the example for validates_format_of so it''s not like you 
have to write the "complex" regex yourself. Just copy-and-paste:

  class Person < ActiveRecord::Base
    validates_format_of :email, :with => 
/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
  end
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Robert Walker wrote:
> Rajinder Yadav wrote:
>> How can I validate and email address without using complex reg-ex is
>> there a simple rails way to do this?
> 
> Are you nuts? That''s just the sort of thing Regexp was designed to
do.
> And, it''s not really all that complex. 
Yes it is.  The *only* correct regexps I am aware of for e-mail 
addresses are on the order of a page in length.  All shorter regexps 
reject some valid e-mail addresses.

Just check for the . and @, and trust the user for the rest.
> The Rails docs even use email 
> validation as the example for validates_format_of so it''s not like
you
> have to write the "complex" regex yourself. Just copy-and-paste:
> 
>   class Person < ActiveRecord::Base
>     validates_format_of :email, :with => 
> /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
>   end
That regexp is just a simple example.  It isn''t even close to covering 
all valid e-mail addresses.  Don''t use it.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
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Marnen Laibow-Koser wrote:
> Robert Walker wrote:
>> Rajinder Yadav wrote:
>>> How can I validate and email address without using complex reg-ex
is
>>> there a simple rails way to do this?
>> 
>> Are you nuts? That''s just the sort of thing Regexp was
designed to do.
>> And, it''s not really all that complex. 
> 
> Yes it is.  The *only* correct regexps I am aware of for e-mail 
> addresses are on the order of a page in length.  All shorter regexps 
> reject some valid e-mail addresses.
Thanks Marnen. I stand corrected.

However, just to clarify, are you saying that Regexp is still the best 
approach? Given that what you''re saying is true, which I''m
sure it is,
then I could imagine that performing this validation without using 
Regexp would be even more complex and require quite a bit more code.
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Robert Walker wrote:
> Marnen Laibow-Koser wrote:
>> Robert Walker wrote:
>>> Rajinder Yadav wrote:
>>>> How can I validate and email address without using complex
reg-ex is
>>>> there a simple rails way to do this?
>>> 
>>> Are you nuts? That''s just the sort of thing Regexp was
designed to do.
>>> And, it''s not really all that complex. 
>> 
>> Yes it is.  The *only* correct regexps I am aware of for e-mail 
>> addresses are on the order of a page in length.  All shorter regexps 
>> reject some valid e-mail addresses.
> 
> Thanks Marnen. I stand corrected.
> 
> However, just to clarify, are you saying that Regexp is still the best 
> approach? Given that what you''re saying is true, which
I''m sure it is,
> then I could imagine that performing this validation without using 
> Regexp would be even more complex and require quite a bit more code.
The best approach is to download a plugin for email validation, because 
someone, somewhere, has already done all the work ;-)
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> Robert Walker wrote:
>> Marnen Laibow-Koser wrote:
>>> Robert Walker wrote:
>>>> Rajinder Yadav wrote:
>>>>> How can I validate and email address without using complex
reg-
>>>>> ex is
>>>>> there a simple rails way to do this?
>>>>
>>>> Are you nuts? That''s just the sort of thing Regexp was
designed
>>>> to do.
>>>> And, it''s not really all that complex.
>>>
>>> Yes it is.  The *only* correct regexps I am aware of for e-mail
>>> addresses are on the order of a page in length.  All shorter
regexps
>>> reject some valid e-mail addresses.
>>
>> Thanks Marnen. I stand corrected.
>>
>> However, just to clarify, are you saying that Regexp is still the  
>> best
>> approach? Given that what you''re saying is true, which
I''m sure it
>> is,
>> then I could imagine that performing this validation without using
>> Regexp would be even more complex and require quite a bit more code.
>
> The best approach is to download a plugin for email validation,  
> because
> someone, somewhere, has already done all the work ;-)

Several some ones...

http://agilewebdevelopment.com/plugins/validates_as_email
http://agilewebdevelopment.com/plugins/validates_as_email_address
http://agilewebdevelopment.com/plugins/validates_email_format_of

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Philip Hallstrom wrote:
> http://agilewebdevelopment.com/plugins/validates_email_format_of
This one does look interesting. Even has support for checking DNS MX 
records. I see more clearly now what Marnen was talking about. This 
plugin certainly does use Regexp, and I have to admit it is quite 
complex. :-)
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Philip Hallstrom wrote:
>> Robert Walker wrote:
>>> Marnen Laibow-Koser wrote:
>>>> Robert Walker wrote:
>>>>> Rajinder Yadav wrote:
>>>>>> How can I validate and email address without using
complex reg-ex is
>>>>>> there a simple rails way to do this?
>>>>>
>>>>> Are you nuts? That''s just the sort of thing Regexp
was designed to do.
>>>>> And, it''s not really all that complex.
>>>>
>>>> Yes it is.  The *only* correct regexps I am aware of for e-mail
>>>> addresses are on the order of a page in length.  All shorter
regexps
>>>> reject some valid e-mail addresses.
>>>
>>> Thanks Marnen. I stand corrected.
>>>
>>> However, just to clarify, are you saying that Regexp is still the
best
>>> approach? Given that what you''re saying is true, which
I''m sure it is,
>>> then I could imagine that performing this validation without using
>>> Regexp would be even more complex and require quite a bit more
code.
>>
>> The best approach is to download a plugin for email validation, because
>> someone, somewhere, has already done all the work ;-)
> 
> 
> Several some ones...
> 
> http://agilewebdevelopment.com/plugins/validates_as_email
> http://agilewebdevelopment.com/plugins/validates_as_email_address
> http://agilewebdevelopment.com/plugins/validates_email_format_of
> 
Thanks Philip =)

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Kind Regards,
Rajinder Yadav

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Aldric Giacomoni wrote:
> Robert Walker wrote:
>> Marnen Laibow-Koser wrote:
>>> Robert Walker wrote:
>>>> Rajinder Yadav wrote:
>>>>> How can I validate and email address without using complex
reg-ex is
>>>>> there a simple rails way to do this?
>>>> 
>>>> Are you nuts? That''s just the sort of thing Regexp was
designed to do.
>>>> And, it''s not really all that complex. 
>>> 
>>> Yes it is.  The *only* correct regexps I am aware of for e-mail 
>>> addresses are on the order of a page in length.  All shorter
regexps
>>> reject some valid e-mail addresses.
>> 
>> Thanks Marnen. I stand corrected.
>> 
>> However, just to clarify, are you saying that Regexp is still the best 
>> approach? Given that what you''re saying is true, which
I''m sure it is,
>> then I could imagine that performing this validation without using 
>> Regexp would be even more complex and require quite a bit more code.
> 
> The best approach is to download a plugin for email validation, because 
> someone, somewhere, has already done all the work ;-)
I wouldn''t trust those plugins without inspecting their algorithms.  I 
would probably use something like the following regex:
/^.+@.+\..+$/

This checks that it''s of the form
"something-f52GMkFzgz+DnLrLYhipotkegs52MxvZ@public.gmane.org", but
performs no further validation.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
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> Aldric Giacomoni wrote:
>> Robert Walker wrote:
>>> Marnen Laibow-Koser wrote:
>>>> Robert Walker wrote:
>>>>> Rajinder Yadav wrote:
>>>>>> How can I validate and email address without using
complex reg-
>>>>>> ex is
>>>>>> there a simple rails way to do this?
>>>>>
>>>>> Are you nuts? That''s just the sort of thing Regexp
was designed
>>>>> to do.
>>>>> And, it''s not really all that complex.
>>>>
>>>> Yes it is.  The *only* correct regexps I am aware of for e-mail
>>>> addresses are on the order of a page in length.  All shorter  
>>>> regexps
>>>> reject some valid e-mail addresses.
>>>
>>> Thanks Marnen. I stand corrected.
>>>
>>> However, just to clarify, are you saying that Regexp is still the  
>>> best
>>> approach? Given that what you''re saying is true, which
I''m sure it
>>> is,
>>> then I could imagine that performing this validation without using
>>> Regexp would be even more complex and require quite a bit more
code.
>>
>> The best approach is to download a plugin for email validation,  
>> because
>> someone, somewhere, has already done all the work ;-)
>
> I wouldn''t trust those plugins without inspecting their
algorithms.  I
> would probably use something like the following regex:
> /^.+@.+\..+$/
>
> This checks that it''s of the form
"something-f52GMkFzgz+DnLrLYhipotkegs52MxvZ@public.gmane.org", but
> performs no further validation.
Good point.  It annoys me to no end when I can''t enter
philip+sitename-LSG90OXdqQE@public.gmane.org
  as a valid email address.  Seems this works about half the time.

The bottom line is if you are really concerned about getting a valid  
email address, the only way to completely verify it is to send them an  
email and make them confirm it via a link in that email.  Headache,  
yeah, but it works.

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validates_format_of :email, :with =>
/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
  end



On Wed, Mar 10, 2010 at 5:16 PM, Rajinder Yadav
<devguy.ca-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> How can I validate and email address without using complex reg-ex is there
> a simple rails way to do this?
>
>
> --
> Kind Regards,
> Rajinder Yadav
>
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>

-- 
Thanks:
Rajeev sharma

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