Emoji Sumator Regex

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

namespace Emoji_Sumator
{
    class Program
    {
        static void Main()
        {
            //lookahead и lookbehind ?=  и ?<=
            string pattern = @"(?<=\s)(?<emoji>:(?<name>[a-z]{4,}):)(?=[\s.,!\?])";

            //the text to dig for emojis
            string textToProcess = Console.ReadLine();

            MatchCollection emojis = Regex.Matches(textToProcess, pattern);

            string emojiCode = Console.ReadLine();

            //get the codes for the letters of the encrypted emoji
            int[] codes = emojiCode.Split(":").Select(int.Parse).ToArray();

            List<string> emojiNames = new List<string>();

            //return the emoji in string form
            string decryptedEmoji = GetEmojiCodeDecrypted(codes);

            int sumPowerEmojis = 0;

            //need this in the end to print emojis if they exist
            bool doesExist = false;

            //need this to know if I have to multiply the power by 2
            bool isDecryptedEmoji = false;

            if (emojis.Count > 0)
            {
                doesExist = true;

                foreach (Match one in emojis)
                {
                    //in group "name" is just the string of letters
                    string emoji = one.Groups["name"].Value;

                    //compare clean emoji without ::
                    if (decryptedEmoji == emoji) isDecryptedEmoji = true;

                    //add the emojis with the ::, so can be printed in the end appropriately
                    //in group "emoji" is the :string:
                    emojiNames.Add(one.Groups["emoji"].Value);

                    //sum the ascii codes
                    sumPowerEmojis += SumEmojisPower(emoji);
                }
            }

            if (isDecryptedEmoji)
            {
                sumPowerEmojis *= 2;
            }

            PrintResult(doesExist, emojiNames, sumPowerEmojis);

        }

        static int SumEmojisPower(string emoji)
        {
            int sum = 0;
            for (int i = 0; i < emoji.Length; i++)
            {
                sum += emoji[i];
            }

            return sum;
        }

        static string GetEmojiCodeDecrypted(int[] code)
        {
            string decryptedEmoji = "";

            for (int i = 0; i < code.Length; i++)
            {
                decryptedEmoji += (char)code[i];

            }
            return decryptedEmoji;
        }

        static void PrintResult(bool foundEmoji, List<string> emojis, int sum)
        {
            if (foundEmoji)
            {
                Console.Write($"Emojis found: {string.Join(", ", emojis)}{Environment.NewLine}");
            }

            Console.WriteLine($"Total Emoji Power: {sum}");
        }
    }
}