public function validate($validator)
    {
        if(!empty ($this->value) && !preg_match('/^fa-[a-z]+/', $this->value))
        {
            $validator->validationError(
                $this->name,
                _t('FontAwesomeIconPickerField.VALIDFONT', 'Please enter a valid Font Awesome font name format.'),
                'validation',
                false
            );
            return false;
        }
        return true;
    }