C#判断字符串是不是Guid唯一编码格式

IsGUID函数用来判断字符串是否是GUID

public static bool IsGUID(string expression)
{
    if (expression != null)
    {
        Regex guidRegEx = 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})$");
        return guidRegEx.IsMatch(expression);
    }
    return false;
}