C#控制电话号码的输入(正则)

if (this.txtPhone.Text.ToString().Trim() != "")
            {
                if (!System.Text.RegularExpressions.Regex.IsMatch(this.txtPhone.Text.ToString().Trim(), @"^((\d{11})|^((\d{7,8})|(\d{4}|\d{3})-(\d{7,8})|(\d{4}|\d{3})-(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1})|(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1}))$)"))
                {
                    Msg.InfoBox("请输入正确的电话号码！");
                    return false;
                }
            }