Sample User Validations

  validates_presence_of     :first_name, :last_name, :zip
  validates_length_of       :password, :within => 6..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 2..50, :too_short => "email must be at least 2 characters", :too_long => "email is too long!"
  validates_format_of       :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :message => "is not formatted properly"
  validates_uniqueness_of   :email, :case_sensitive => false, :message => "is already in the system"