using System;

    using System.Text.RegularExpressions;

​

​

public class Program

{

            public const string FullMessagePattern = @"(?<Timestamp>.*?): \[(?<Level>.*?)]: (?<Message>.*)";

​

            private static readonly Regex FullMessageRegex = new Regex(FullMessagePattern);

​

    public static void Main()

    {

        var match = FullMessageRegex.Match(": []: 123");

        Console.WriteLine("{0} {1} {2} {3}", match.Success, match.Groups["Timestamp"].Success, match.Groups["Level"].Success, match.Groups["Message"].Success);

    }

}