Special characters Regex

Question

Hello I'm try to remove special characters from user inputs.

        public void fd()
        {
            string output = "";
            string input = Console.ReadLine();
            char[] charArray = input.ToCharArray();

            foreach (var item in charArray)
            {

                if (!Char.IsLetterOrDigit(item))
                {

                   \\\CODE HERE                    }

            }

            output = new string(trimmedChars);
            Console.WriteLine(output);
        }

At the end I'm turning it back to a string. My code only removes one special character in the string. Does anyone have any suggestions on a easier way instead

Answer 1

You have a nice implementation, just consider using next code, which is only a bit shorter, but has a little bit higher abstractions

var input =  " th@ere's! ";

Func<char, bool> isSpecialChar = ch => !char.IsLetter(ch) && !char.IsDigit(ch);

for (int i = 1; i < input.Length - 1; i++)
{
    //if current character is a special symbol
    if(isSpecialChar(input[i])) 
    {
        //if previous or next character are special symbols
        if(isSpecialChar(input[i-1]) || isSpecialChar(input[i+1]))
        {
            //remove that character
            input = input.Remove(i, 1);
            //decrease counter, since we removed one char
            i--;
        }
    }
}
Console.WriteLine(input); //prints " th@ere's "

A new string would be created each time you would call Remove. Use a StringBuilder for a more memory-performant solution.