Question

How to remove all non-alphanumeric characters from a string in C#

Answer 1

using System;
 
public class removeAllNonAlphanumericCharacters_CSharp
{
    static string removeAllNonAlphanumericCharacters(string str) {
        char[] arr = str.ToCharArray();
 
        arr = Array.FindAll<char>(arr, (ch => (char.IsLetterOrDigit(ch))));
                                         
        return new string(arr);
    }
    
    static void Main()
    {
        string str = "-csharp-  >>-progr{@()}amm.. #$ing-";
         
        str = removeAllNonAlphanumericCharacters(str);
         
        Console.WriteLine(str);
    }
}
 
 
/*
run:
 
csharpprogramming
 
*/

 

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Answer 2

using System;
using System.Text.RegularExpressions;

public class removeAllNonAlphanumericCharacters_CSharp
{
    static string removeAllNonAlphanumericCharacters(string str) {
        return Regex.Replace(str, "[^a-zA-Z0-9]", "");
    }
    
    static void Main()
    {
        string str = "-csharp-  >>-progr{@()}amm.. #$ing-";
         
        str = removeAllNonAlphanumericCharacters(str);
         
        Console.WriteLine(str);
    }
}
 
 
/*
run:
 
csharpprogramming
 
*/

 

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Answer 3

using System;
using System.Linq;

public class removeAllNonAlphanumericCharacters_CSharp
{
    static string removeAllNonAlphanumericCharacters(string str) {
        return new string(str.Where(c => char.IsLetterOrDigit(c)).ToArray());
    }
    
    static void Main()
    {
        string str = "-csharp-  >>-progr{@()}amm.. #$ing-";
         
        str = removeAllNonAlphanumericCharacters(str);
         
        Console.WriteLine(str);
    }
}
 
 
/*
run:
 
csharpprogramming
 
*/

 

70+ SQL courses for beginners and professionals