[C#][Regex] Hjälp med förbättra koden tar lång tid på sig

public static Dictionary<string, string> regexlistas = new Dictionary<string, string>();

private void searchregex(string dir, string open)
        {
            #region regexlistas funder
            if (File.Exists(dir))
            {
                foreach (var d in regexlistas)
                {
                    Regex regex = new Regex(d.Key);
                    Match match = regex.Match(open);
                    if (match.Success == true)
                    {
                        form1.SaveFile(d.Value, dir);
                        fond++;
                        break;
                    }
                }
            }
            #endregion
        }

private static List<Regex> test = new List<Regex>();
public static Dictionary<string, string> regexlistas = new Dictionary<string, string>();

foreach (var s in regexlistas)
            {
                var g = new Regex(s.Key, RegexOptions.Compiled);
                test.Add(g);
            }

foreach (Regex r in test)
            {
                Match match = r.Match("10.52.1.6");
                if (match.Success == true)
                {
                    Console.WriteLine(match.Value);
                }
            }

Match match = r.Match(open);

Match match = r.Match("test");

string[] files = Directory.GetFiles("Store", "*.txt");

            foreach (string dir in files)
            {
                string filename = Path.GetFileNameWithoutExtension(dir);

                if (!cachelists.Contains(filename))
                {
                    string open = File.ReadAllText(dir);

                    var task = Task.Run(() => search.search(dir, open));
                    tasks.Add(task);

                    if (tasks.Count() == 3)
                    {
                        Task.WaitAll(tasks.ToArray());
                        tasks.Clear();
                    }

                    cachelists.Add(filename);
                }

private void searchlistas(string dir, string open)
        {
            #region listas funder
            if (File.Exists(dir))
            {
                foreach (string s in listas)
                {
                    if (open.Contains(s))
                    {
                        form1.SaveFile(s, dir);
                        fond++;
                        break;
                    }
                }
            }
            #endregion
        }
        private void searchregex(string dir, string open)
        {
            #region regexlistas funder
            if (File.Exists(dir))
            {
                foreach (var d in regexlistas)
                {
                    Regex regex = new Regex(d.Key);
                    Match match = regex.Match(open);
                    if (match.Success == true)
                    {
                        form1.SaveFile(d.Value, dir);
                        fond++;
                        break;
                    }
                }
            }
            #endregion
        }

        public void search(string dir, string open)
        {
            //searchlistas(dir, open);
            searchregex(dir, open);
        }

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?