Complicated Regular expression scenario.

Try this:

using System;
using System.Text.RegularExpressions;


class Program
{
   static void Main() 
   {
     string text = @"This is sample string #TAG#0.00-0##0#[ ] (a) this is another sample string. This is third sample string #TAG#0.00-0##0#[ This is a text] Another sample string.";
     string regFind = @"(#TAG#0\.00-0##0#)(\[.*?])";
     string regReplace = @"$2 ";
     text = Regex.Replace(text, regFind, regReplace);
     Console.WriteLine(text);
     Console.ReadKey(); 
   }
}


The console output should be:

This is sample string [ ] (a) this is another
 sample string. This is third sample string [ This i
s a text] Another sample string.

EDIT:

I've removed the preceding backslashes from the # characters in 'regFind' as it works fine without them. I thought from memory that # was a Regex meta-character but apparently it isn't.