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Replace invalid characters with empty strings by using Regular expression

using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; using System.Xml; using System.IO; namespace Billing {     public class StringUtils     {         public static String CleanInput(string str)         {             // Replace invalid characters with empty strings.             return Regex.Replace(str, @"[^\w ]", "");         }     } }