using System;

using System.Text.RegularExpressions;

​

public class Program {

    public static void Main() {

        string input = 

@"

-- text goes here --

"; 

        input = regexReplace(input, @"#", "+");

        input = regexReplace(input, @"((<?\s)_)|(_(?=\s))", "//");

        input = regexReplace(input, @"!\[\]\((?'asdf'[^()]+)\)", "${asdf}");

        input = regexReplace(input, @"</?i>", "//");

        input = regexReplace(input, @"</?center>", "");

        input = regexReplace(input, @"```", "");

        input = regexReplace(input, @"-{3,}", "------");

        input = regexReplace(input, @"\[ToC\]", "[[toc]]");

        input = regexReplace(input, @"\[(?'asdf'[^\[\]]+)\]\((?'fdsa'[^()]+)\.md\)", "[[[${fdsa}|${asdf}]]]"); input = regexReplace(input, @"\\", ""); input = regexReplace(input, @"<!--.+-->", "");

        // input = regexReplace(input, @"___", "___");

        Console.WriteLine(input);

    }

    private static string regexReplace(string input, string pattern, string replace) {

        return new Regex(pattern).Replace(input, replace);

    }

}