using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		string InputText = "12/03/2015 *** [RandomText] // 1.04.1112V";
		string regex = @"([0-9/]*) \*\*\* \[([A-Za-z]*)\] \/\/ (.*)";
		string Name = "GoogleChrome";
		string OutputPattern1 = "{1} - {Name} version {4}";
		string OutputPattern2 = "{Name}_{3}";
		string rx =  @"{(?:(\d+)|Name)}";
		var match  = Regex.Match(InputText, regex);
		if (match.Success) {
			Console.WriteLine(
				Regex.Replace(OutputPattern1, rx, x=>
					!x.Groups[1].Success ? Name:
						int.Parse(x.Groups[1].Value) < match.Groups.Count ? 
							match.Groups[int.Parse(x.Groups[1].Value)].Value :
							x.Value)
			);
		}
	}
}
 

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