# File lib/authlogic/acts_as_authentic/login.rb, line 81
        def validates_format_of_login_field_options(value = nil)
          rw_config(
            :validates_format_of_login_field_options,
            value,
            {
              :with => Authlogic::Regex.login,
              :message => proc do
                I18n.t(
                  'error_messages.login_invalid',
                  :default => "should use only letters, numbers, spaces, and .-_@+ please."
                )
              end
            }
          )
        end