using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

​

public class Program

{

    public static string StripDomains(string text, string replacement = "")

    {

        // Full URLs, all TLDs

        Regex reFull = new Regex(@"http\w*://([-A-Z0-9+&@#/%=~_|$?!:,.]+\.)+[a-z]{2,}[^\s,]*", 

                                 RegexOptions.IgnoreCase | RegexOptions.Multiline);

        text = reFull.Replace(text, replacement);

        // Specific TLDs

        string domains = "(com|net|org|info|co.uk|fr|biz|io|edu|gov|mil|aero|mobi|name)";

        Regex rePart = new Regex(@"([-A-Z0-9+&@#/%=~_|$?!:,.]+\.)+" + domains + "[^\\s,]*", 

                                 RegexOptions.IgnoreCase | RegexOptions.Multiline);

        text = rePart.Replace(text, replacement);

        return text;

    }

    public static string StripBlacklisted(string text, string[] blacklist, string repl = "")

    {

        foreach (string str in blacklist) {

            text = ReplaceText(text, str, repl);

        }

        return text;

    }

    public static string ReplaceText(string text, string find, string repl = "")

    {

        Regex re = new Regex(@find, RegexOptions.IgnoreCase | RegexOptions.Multiline);

        text = re.Replace(text, repl);              

        return text;

    }

​

    public static string FormatText(Dictionary<string, string> keywords, string text)

    {

        foreach (KeyValuePair<string, string> keyword in keywords) {

            text = ReplaceText(text, keyword.Key, keyword.Value);

        }

        return text;

    }

​

    public static void Main()

    {

        string text = "Hello säläm this Բարեւ is an Héébee Salü Emoji ☺ ✌ \ud83d\udc59 ✈ Бзиа збаша\ud83d\ude18 \ud83d\ude0d Ç'kemi\ud83d\udcaa Ç'kemi 你好  \ud83d\udc9b \ud83d\udc38 \ud83d\ude02 ☁ ⚡ ⛄";

        Console.WriteLine("Original:\n" + text);

        // Remove blacklisted terms

        String[] blacklist = new string[] {

            @"(?<=\s|^)([\u1F60-\uFFFF]+|([O3>]|)[:;8](?:[\-'|]|)[)(\]\[DPO*v3|/]|[oO\-^][._][oO\-^]|<3|\((?:y|[\^]{3})\)|:[a-z]{2,8}:|<\(\""\))(?=\s|$)",

        };

        text = StripBlacklisted(text, blacklist);       

        Console.WriteLine("-----"); 

        Console.WriteLine("Stripped Blacklisted:\n" + text);

    }

}