using System;
using System.Text.RegularExpressions;
namespace RegExApplication
{
public class Program
{
public static void Main(string[] args)
{
var pattern = "^([A-Za-z0-9_]{4})_([A-Za-z0-9_]{4})$";
var template = "ZZZZ_ss16";
var replaceWith = "${1}0%$2";
var regex = new Regex(pattern);
Console.WriteLine(regex.Replace(template, replaceWith));
}
}
}
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