验证多重电子邮件地址(validation for multipe email addresses)

 为了通过在文本字段（多文件电子邮件地址）中提供他们的邮件地址来邀请新用户，我需要验证给定的电子邮件地址格式并需要显示正确的错误消息。这里我使用的是每个电子邮件地址之间的空格。（例如useremail@gmail.com useremail2@yahoo.com ）请指导我。 
 
 1）如何验证用户电子邮件地址格式？ 
 
 2）如何检查用户是否在两个电子邮件地址之间没有使用空间？ 
 
 3）建议一些最好的方法来做到这一点。 
 
 我正在使用rails（2.3.X和ruby 1.8.7） 
 
 用户控制器 
 
def invite_users
  if request.get?
    #render invite_users.html.erb
  elsif request.post?
    if !params[:email_ids].blank? && !params[:message].blank?
      @email_ids = params[:email_ids].split(/ |, |,/)
      @message = params[:message]
      @inviting_users = @email_ids.count
      @inviting_users.times do
        @all_emails = []
        @all_emails = @email_ids.shift
        activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join)
        UserNotifier.deliver_invite_users(@all_emails, @message,activation_code, current_company)
        end
     else
       flash[:notice] = "Please fill all the fields"
     end
  end
end

For inviting the new user by giving their mail addresses in text field(multipe email addresses), i need to validate the given email addresses format and need to show the proper error message.Here i am using the space between the each email addresses.(for example useremail@gmail.com useremail2@yahoo.com)Please guide me.
 
1)How to validate user email addresses format?.
 
2)How to check if the user doesn't use space between the two email addresses?.
 
3)Suggest some best way to do this.
 
i am using rails(2.3.X and ruby 1.8.7)
 
User controller
 
def invite_users
  if request.get?
    #render invite_users.html.erb
  elsif request.post?
    if !params[:email_ids].blank? && !params[:message].blank?
      @email_ids = params[:email_ids].split(/ |, |,/)
      @message = params[:message]
      @inviting_users = @email_ids.count
      @inviting_users.times do
        @all_emails = []
        @all_emails = @email_ids.shift
        activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join)
        UserNotifier.deliver_invite_users(@all_emails, @message,activation_code, current_company)
        end
     else
       flash[:notice] = "Please fill all the fields"
     end
  end
end

原文：https://stackoverflow.com/questions/12314913