You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: casting_invitor.rb
    path of file: ./repos/coverband/test/fixtures
    
    the code of the file until where you have to start completion: class CastingInviter
  EMAIL_REGEX = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/

  attr_reader :message, :invitees, :casting

  def initialize(attributes = {})
    @mes
    
  def deliver
    if valid?
      invitee_list.each do |email|
        invitation = create_invitation(email)
        Mailer.invitation_notification(invitation, @message)
      end
    else
      failure_message =
        "Your #{
          @casting
        } message couldnâ€™t be sent. Invitees emails or message are invalid"
      invitation = create_invitation(@sender)
      Mailer.invitation_notification(invitation, failure_message)
    end