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Is Alpha Numeric With Space 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 bool IsAlphaNumericWithSpace(string str)         {             return Regex.IsMatch(str, "^[a-zA-Z0-9 ]*$");         }     } }