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)
 {
 //https://visualstudiogallery.msdn.microsoft.com/16b9d664-d88c-460e-84a5-700ab40ba452
 string pattern = @"<span([^>]*)class=\""(\w+)\""([^>]*)>(.*)<\/span>";
 RegexOptions regexOptions = RegexOptions.Multiline;
 Regex regex = new Regex(pattern, regexOptions);
 string inputData = @"Dave
 George
 
 <table><tr><td class='1' style=''>m</td></tr><tr><td class='2' style=''>a</td></tr><tr><td class='3' style=''>n</td></tr></table>
 George
 ";
 foreach (Match match in regex.Matches(inputData))
 {
 if (match.Success)
 {
 //TODO processing results
 //Console.WriteLine ("Value:{0}", match.Value);
 Console.WriteLine ("Grp0: {0}",match.Groups[0].Value);
 Console.WriteLine ("Grp1: {0}",match.Groups[1].Value);
 Console.WriteLine ("Grp2: {0}",match.Groups[2].Value);
 Console.WriteLine ("Grp3: {0}",match.Groups[3].Value);
 Console.WriteLine ("Grp4: {0}",match.Groups[4].Value);
 }
 }
 
 Console.WriteLine(
 regex.Replace (inputData, "<span${1}class=\"${2}\"${3}>Replacement")
 );
 Console.WriteLine(
 regex.Replace (inputData, "Before class: ${1}\n Class Attribute:${2}\n After class: ${3}\n Element:${4}\n")
 );
 
 }
 }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.16 sec, absolute running time: 0.2 sec, cpu time: 0.19 sec, average memory usage: 20 Mb, average nr of threads: 4