RegEx validation

using System;
using System.Text.RegularExpressions;
					
public class Program
{
	public void Main()
	{
		
		string[] guids = {
			"0C885DD3-7DD9-484B-9B20-3E6552BCA144", 
			"{0C885DD3-7DD9-484B-9B20-3E6552BCA144}",
			"0C885DD37DD9484B9B203E6552BCA144",
			"{0C885DD3-7DD9-484B-9B20-1E6552BCA144}",
			"0C885DD3-7DD9484B9B203E6552BCA144", 
			"0C885DD37DD9484B9B203E6552BCA14"
			};
		
		foreach(var guid in guids)
			TestGuid(guid);
		
	}

	public void TestGuid(string guid)
	{
		
		Console.WriteLine(
			String.Format("{0} : {1}, {2}", 
						  guid, 
						  guid.IsGuid(), 
						  guid.IsGuidRegEx()));
	}
}

public static class StringHelper
{
	public static bool IsGuid(this string guid)
	{
		Guid newGuid;
		return Guid.TryParse(guid, out newGuid);
	}
	
	public static bool IsGuidRegEx(this string guid)
	{
		if (guid != null)
		{
			Regex guidRegEx = 
				new Regex(@"^[{]?[0-9a-fA-F]{8}[-]?([0-9a-fA-F]{4}[-]?){3}[0-9a-fA-F]{12}[}]?$");
			
			return guidRegEx.IsMatch(guid);
		}
		return false;
	}
}