Regex remove special characters

Question

We need a C# function which will remove all special characters from a string.

Also, is it possible to change "George's" to "George" (remove both single quote and character s)?

Answer 1

This method will removed everything but letters, numbers and spaces. It will also remove any ' or " followed by the character s.

public static string RemoveSpecialCharacters(string input)
{
    Regex r = new Regex("(?:[^a-z0-9 ]|(?<=['\"])s)", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
    return r.Replace(input, String.Empty);
}

Answer 2

public static string RemoveSpecialCharacters(string input)
{    
    Regex r = new Regex(
                  "(?:[^a-zA-Z0-9 ]|(?<=['\"])s)",
                  RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
    return r.Replace(input, String.Empty);    
}

Ryan's answer is right. Just add A-Z as well as many people would need it.