using System;
using System.Text.RegularExpressions;

namespace com.ignitionlabs.utilities {

	public class InputFilter {
		
		
		public static void Main() {
			String badInput = ">\"'><script>alert(\"say something bad here\")</script>";
			Console.WriteLine("badInput = " + badInput);
			String filteredInput = InputFilter.Filter(badInput);
			Console.WriteLine("filteredInput = " + filteredInput);
			
			
		}
		
		public static String Filter(String userInput) {
			Regex re = new Regex("([^A-Za-z0-9@.' _-]+)");
			String filtered = re.Replace(userInput, "_");            
			return filtered;	
		}
		
		
		
	}

}