using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
        string fileLogs = @"[08:52:18] [ERROR] Ceci doit aparaitre 
[08:52:18] [WARN] Bonjour ";
        var result = Regex.Matches(fileLogs, @"\[(.+)\] \[(.+)\] (.+)");

        foreach (Match match in result)
        {
            string time = match.Groups[1].Value;
            string type = match.Groups[2].Value;
            string messsage = match.Groups[3].Value;
            Console.WriteLine("{0} | {1} | {2}", time, type, messsage);
        }
	}
}