gistfile1.txt

validates :full_name, :email_address, :presence => true
validates_format_of :email_address, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/
validate :email_address, :uniqueness => true
validate :display_name, :length => {:minimum => 2, :maximum => 32 }, :allow_nil