using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var input = "text, *text*, text, text, (text), [text], [some_text with _*](http://.....) *text*, text, text, (text), [text]";
		var pattern = @"(\[[^][]*]\([^()]*\))|[][()*_]";
        Console.WriteLine(Regex.Replace(input, pattern, m => 
        	m.Groups[1].Success ? m.Groups[1].Value : $@"\{m.Value}"));
	}
}