Remove non-alphanumeric characters from a string in C#

In this article, we will see how to Remove non-alphanumeric characters from a string in C#

Using Regular Expression


















private static void RemoveNoAlphaChar()
        {
            string str = "dotnetoffice16@gmail.com";

            str = Regex.Replace(str, "[^a-zA-Z0-9]", String.Empty);
            Console.WriteLine(str);
            Console.ReadLine();
        }




Code language: C# (cs)

the output will be like below, which doesn't contain @ and .(dot)

dotnetoffice16gmailcom

2.. Using Array.FindAll() method

The Array.FindAll() method returns all elements of the specified sequence which satisfy a certain condition. To filter only alphanumeric characters, pass Char.IsLetterOrDigit to the FindAll() method, as below:

    private static void RemoveNoAlphaChar()
        {
            string str = "dotnetoffice16@gmail.com";

            str = String.Concat(Array.FindAll(str.ToCharArray(), Char.IsLetterOrDigit));
            Console.WriteLine(str);
            Console.ReadLine();
        }




















Code language: C# (cs)

3. Using LINQ

Another similar solution uses LINQ’s Where() method to filter elements of a sequence based on a condition.

        private static void RemoveNoAlphaChar()
        {
            string str = "dotnetoffice16@gmail.com";

            str = String.Concat(str.Where(char.IsLetterOrDigit));
      
            Console.WriteLine(str);
            Console.ReadLine();
        }



















Code language: C# (cs)