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Use regualr expression to check if a string is a GUID

//New BSD License (BSD) //http://bluecms.codeplex.com/license using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace BlueCMS.Core.Extensions {     public static class StringExtensions     {         private static Regex _isGuid = new Regex(@"^(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}$", RegexOptions.Compiled);         public static bool IsGuid(this string @this)         {             return _isGuid.IsMatch(@this);         }     } }