C# regex kullanımı

public static string DecodeIllegalCharecters(string Text) => System.Text.RegularExpressions.Regex.Replace(Text, @"(\s+|@|&|'|\(|\)|<|>|#)", "");

 public static bool IsValidEmail(string email)
        {
           return System.Text.RegularExpressions.Regex.IsMatch(email, @"\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        }

public static bool IsUrlValid(string url)
        {

            string pattern = @"^(http|www|https|ftp|)\://|[a-zA-Z0-9\-\.]+\.[a-zA-Z](:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~])*[^\.\,\)\(\s]$";
            Regex reg = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
            return reg.IsMatch(url);
        }

    public static int IsUrlValidCount(string text)
        {
            var linkParser = new Regex(@"(\b(https?|http|ftp|file)://)?[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]", RegexOptions.Singleline | RegexOptions.IgnoreCase);
            return linkParser.Matches(text).Count;
        }