using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var myResponse = @"<td colspan=""2"" class=""invalid"">
28 Errors, 3 warning(s)
</td>";
var TdTag = Regex.Matches(myResponse, @"(?s)<td[^<]*>\s*(\d+)[^<]*</td>");
var result = TdTag[0].Groups[1].Value;
Console.WriteLine(result);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgpwdWJsaWMgY2xhc3MgVGVzdAp7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCgl7CgkJdmFyIG15UmVzcG9uc2UgPSBAIjx0ZCBjb2xzcGFuPSIiMiIiIGNsYXNzPSIiaW52YWxpZCIiPgogIDI4IEVycm9ycywgMyB3YXJuaW5nKHMpCgoKPC90ZD4iOwogICAgICAgIHZhciBUZFRhZyA9IFJlZ2V4Lk1hdGNoZXMobXlSZXNwb25zZSwgQCIoP3MpPHRkW148XSo+XHMqKFxkKylbXjxdKjwvdGQ+Iik7CiAgICAgICAgdmFyIHJlc3VsdCA9IFRkVGFnWzBdLkdyb3Vwc1sxXS5WYWx1ZTsKICAgICAgICBDb25zb2xlLldyaXRlTGluZShyZXN1bHQpOwoJfQp9