T, C# - rextester

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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
           string s='jmano';
//https://visualstudiogallery.msdn.microsoft.com/16b9d664-d88c-460e-84a5-700ab40ba452
           var regex = new System.Text.RegularExpressions.Regex("<td([^>]*)class='1'[^>]*>("+s+".*?)</td>*");
            var m = regex.Match("<table><tr><td class='1' style=''>manoj</td></tr><tr><td class='2' style=''>a</td></tr><tr><td class='3' style=''>n</td></tr></table><table><tr><td class='1' style=''>jmano</td></tr><tr><td class='2' style=''>a</td></tr><tr><td class='3' style=''>n</td></tr></table>");
            Console.WriteLine(m.Groups[2].Value);
             Console.WriteLine ("Grp0: {0}",m.Groups[0].Value);
                    Console.WriteLine ("Grp1: {0}",m.Groups[1].Value);
                    Console.WriteLine ("Grp2: {0}",m.Groups[2].Value);
                    Console.WriteLine ("Grp3: {0}",m.Groups[3].Value);
                    Console.WriteLine ("Grp4: {0}",m.Groups[4].Value);
           
           
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,17 sec, cpu time: 0,19 sec, average memory usage: 16 Mb, average nr of threads: 4