Regular Expressions C#

//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);
        }
    }
}