using System;

using System.Text.RegularExpressions;

​

public class Example

{

    public static void Main()

    {

        string pattern = @"[\\\""\(\)]";

        string input = @"\ "" ()

abc\asd""asdasd(dasdasd)";

        RegexOptions options = RegexOptions.Multiline;

        foreach (Match m in Regex.Matches(input, pattern, options))

        {

            Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);

        }

        Console.WriteLine(Regex.Replace(input,pattern,""));

    }

}