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

?

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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;        }    }