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 = @"<td([^>]*)class=\""(\w+)\""([^>]*)>(.*)<\/td>";
            RegexOptions regexOptions = RegexOptions.Multiline;
            Regex regex = new Regex(pattern, regexOptions);
            string inputData = @"<span class=""nameLastname"">Dave</span>
                                <span id=""id1"" class=""nameLastname"" style="""">George</span>
                                <span id=""id2"" class=""className"" style=""whatever""><span /></span>
                 <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>
                                <span id=""id1"" class=""nameLastname"" style="""">George</span>
                                <span id=""id2"" class=""className"" style=""whatever""><span /></span>";
            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</span>")
            );
            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: 0,12 sec, absolute running time: 0,19 sec, cpu time: 0,19 sec, average memory usage: 17 Mb, average nr of threads: 4

latest | history

Grp0: <span class="nameLastname">Dave</span>
Grp1:  
Grp2: nameLastname
Grp3: 
Grp4: Dave
Grp0: <span id="id1" class="nameLastname" style="">George</span>
Grp1:  id="id1" 
Grp2: nameLastname
Grp3:  style=""
Grp4: George
Grp0: <span id="id2" class="className" style="whatever"><span /></span>
Grp1:  id="id2" 
Grp2: className
Grp3:  style="whatever"
Grp4: <span />
Grp0: <span id="id1" class="nameLastname" style="">George</span>
Grp1:  id="id1" 
Grp2: nameLastname
Grp3:  style=""
Grp4: George
Grp0: <span id="id2" class="className" style="whatever"><span /></span>
Grp1:  id="id2" 
Grp2: className
Grp3:  style="whatever"
Grp4: <span />
<span class="nameLastname">Replacement</span>
                                <span id="id1" class="nameLastname" style="">Replacement</span>
                                <span id="id2" class="className" style="whatever">Replacement</span>
                 <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>
                                <span id="id1" class="nameLastname" style="">Replacement</span>
                                <span id="id2" class="className" style="whatever">Replacement</span>
Before class:  
 Class Attribute:nameLastname
 After class: 
 Element:Dave

                                Before class:  id="id1" 
 Class Attribute:nameLastname
 After class:  style=""
 Element:George

                                Before class:  id="id2" 
 Class Attribute:className
 After class:  style="whatever"
 Element:<span />

                 <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>
                                Before class:  id="id1" 
 Class Attribute:nameLastname
 After class:  style=""
 Element:George

                                Before class:  id="id2" 
 Class Attribute:className
 After class:  style="whatever"
 Element:<span />

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