C#: Remove special characters from a given text

Last update on December 20 2024 12:43:02 (UTC/GMT +8 hours)

Write a C# Sharp program to remove special characters from given text. Return the updated string which allows alphanumeric characters, spaces, underscores _ and dashes -.

Note: A special character is a character that is not an alphabetic or numeric character. Special characters are: ., !, @, #, $, %, ^, &, \, *, (, )

Sample Data:
("AA@%^&CC") -> "AACC"
("Python") -> "Python"
("w3resource.com") -> "w3resourcecom"

Sample Solution-1:

C# Sharp Code:

using System;
using System.Text.RegularExpressions;

namespace exercises
{
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Define and initialize test strings
            string text1 = "AA@%^&CC";
            Console.WriteLine("Original string: " + text1);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text1));

            // Update the test string
            text1 = "Python";
            Console.WriteLine("Original string: " + text1);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text1));

            // Update the test string
            text1 = "w3resource.com";
            Console.WriteLine("Original string: " + text1);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text1));
        }

        // Method to remove special characters from a string using Regex
        public static string test(string text)
        {
            // Replace any character that is not a letter, digit, space, underscore, or hyphen with an empty string
            return Regex.Replace(text, "[^0-9A-Za-z _-]", "");
        }
    }
}

Sample Output:

Original string: AA@%^&CC
New string: AACC
Original string: Python
New string: Python
Original string: w3resource.com
New string: w3resourcecom

Flowchart:

Sample Solution-2:

C# Sharp Code:

using System;
using System.Text.RegularExpressions;

namespace exercises
{
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Define and initialize test strings
            string text = "AA@%^&CC";
            Console.WriteLine("Original string: " + text);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text));

            // Update the test string
            text = "Python";
            Console.WriteLine("Original string: " + text);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text));

            // Update the test string
            text = "w3resource.com";
            Console.WriteLine("Original string: " + text);

            // Call the test method and display the modified string
            Console.WriteLine("New string: " + test(text));
        }

        // Method to remove special characters from a string using Regex
        public static string test(string text)
        {
            // Replace any character that is not a letter, digit, space, underscore, or hyphen with an empty string
            return Regex.Replace(text, @"[^\w \-]", "");
        }
    }
}

Sample Output:

Original string: AA@%^&CC
New string: AACC
Original string: Python
New string: Python
Original string: w3resource.com
New string: w3resourcecom

Flowchart:

C# Sharp Code Editor:

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