Validate GUID's via RegEx

How to validate a valid GUID Value in C#

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);

                                    internal static bool IsGuid(string candidate, out Guid output)

                                    {

                                                bool isValid = false;

                                                output=Guid.Empty;

                                                if(candidate!=null)

                                                {

                                               

                                                            if (isGuid.IsMatch(candidate))

                                                            {

                                                                        output=new Guid(candidate);

                                                                        isValid = true;

                                                            }

                                                }

                                                return isValid;

                                    }

This might be handy as use GUIDs a great deal in my API's.
(Souce leached so I can find it in the future by searching my blog... Original code posted on Scott Galloway's Blog)