WPF 输入框正则效验

1.

if (!TelphoneHelper2.IsTelphone(mobile)
{
MessageBox.Show("请录入正确的手机号！", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
return;
}

2.TelphoneHelper2.cs

 public class TelphoneHelper2
    {
        public static bool IsTelphone(string tel)
        {
            String strExp = @"[0-9][0-9][0-9]{9}";
            Regex r = new Regex(strExp);
            Match m = r.Match(tel);
            return m.Success;
        }
    }