From: Kevin Brown <blargity@...>
Date: 2006-01-05T02:59:32+09:00
Subject: Re: Email address validation (was: silly regex question)

On Wednesday 04 January 2006 06:25, Jeffrey Moss wrote:
> I was just perfecting my email address validator, mine allows multiple
> email addresses in the email_address field:
>
> validates_format_of :email_address, :with =>
> /^\s*(?:(?:[^,@\s]+)@(?:(?:[-a-z0-9]+\.)+[a-z]{2,}\s*(,\s*|\z)))+$/i,
>
> :allow_nil => true
>
> It doesn't do as careful of an inspection as yours, although I've seen
> some validations that are far more detailed. It'd be nice to have some
> people contribute their suggestions for the ultimate email address
> validation regular expression.
>
> I also have this handy method in my class:
>
>   def email_addresses
>     self.email_address.split(',').map{|a| a.lstrip.rstrip }
>   end

Why do you lstrip and then rstrip?  Won't a simple strip work for you?

> -Jeff
>
> On Wed, Jan 04, 2006 at 08:27:58AM +0900, Dan Kohn wrote:
> > Here's a rails example for validating email addresses.
> >
> >   validates_format_of :login, :with => /
> >     ^[-^!$#%&'*+\/=?`{|}~.\w]+
> >     @[a-zA-Z0-9]([-a-zA-Z0-9]*[a-zA-Z0-9])*
> >     (\.[a-zA-Z0-9]([-a-zA-Z0-9]*[a-zA-Z0-9])*)+$/x,
> >
> >     :message => "must be a valid email address",
> >     :on => :create