C# 正则表达式的使用（TextBox）

        private void XXX_KeyPress(object sender, KeyPressEventArgs e)
        {
            if ((Convert.ToInt32(e.KeyChar) == 8))
            {
                e.Handled = false;
            }
            else
            {
                Regex regex = new Regex(@"？？？？？？？？？？？");
                Match result = regex.Match(Convert.ToString(e.KeyChar));
                if (result.Success)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                }
            }
        }