using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        String text = "[Testing.User]|Info:([Testing.Info]|Name:([System.String]|Matt)|Age:([System.Int32]|21))|Description:([System.String]|This is some description)";

        String pattern = "(\\[\\w+\\.\\w+\\])\\|(\\w+:.+)\\|(\\w+:.+)";

        Match match = Regex.Match(text, pattern);

        if (match.Success)

        {

            Console.WriteLine(match.Groups[1]);

            Console.WriteLine(match.Groups[2]);

            Console.WriteLine(match.Groups[3]); 

        }

    }

}