code: function(options) {
        inputEx.IPv4Field.superclass.setOptions.call(this, options);
        this.options.messages.invalid = inputEx.messages.invalidIPv4;
        this.options.regexp = /^(?:1\d?\d?|2(?:[0-4]\d?|[6789]|5[0-5]?)?|[3-9]\d?|0)(?:\.(?:1\d?\d?|2(?:[0-4]\d?|[6789]|5[0-5]?)?|[3-9]\d?|0)){3}$/;
     }
docs: set IPv4 regexp and invalid string
  @param {Object} options Options object as passed to the constructor