C#端口、IP正则

端口正则：

string pattrn = "^[0-9]+$";

if (System.Text.RegularExpressions.Regex.IsMatch(PorttextBox.Text.Trim(), pattrn)){}；

IP正则：

string _pattrn = @"(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])";

if (System.Text.RegularExpressions.Regex.IsMatch(this.IptextBox.Text, _pattrn)){}；