//parse single cookie string to a cookie
    //example: 
    //MSPShared=1; expires=Wed, 30-Dec-2037 16:00:00 GMT;domain=login.live.com;path=/;HTTPOnly= ;version=1
    //PPAuth=CkLXJYvPpNs3w!fIwMOFcraoSIAVYX3K!CdvZwQNwg3Y7gv74iqm9MqReX8XkJqtCFeMA6GYCWMb9m7CoIw!ID5gx3pOt8sOx1U5qQPv6ceuyiJYwmS86IW*l3BEaiyVCqFvju9BMll7!FHQeQholDsi0xqzCHuW!Qm2mrEtQPCv!qF3Sh9tZDjKcDZDI9iMByXc6R*J!JG4eCEUHIvEaxTQtftb4oc5uGpM!YyWT!r5jXIRyxqzsCULtWz4lsWHKzwrNlBRbF!A7ZXqXygCT8ek6luk7rarwLLJ!qaq2BvS; domain=login.live.com;secure= ;path=/;HTTPOnly= ;version=1
    public bool parseSingleCookie(string cookieStr, ref Cookie ck)
    {
        bool parsedOk = true;
        //Cookie ck = new Cookie();
        //string[] expressions = cookieStr.Split(";".ToCharArray(),StringSplitOptions.RemoveEmptyEntries);
        //refer: http://msdn.microsoft.com/en-us/library/b873y76a.aspx
        string[] expressions = cookieStr.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
        //get cookie name and value
        pairItem pair = new pairItem();
        if (parseCookieNameValue(expressions[0], out pair))
        {
            ck.Name = pair.key;
            ck.Value = pair.value;

            string[] fieldExpressions = getSubStrArr(expressions, 1, expressions.Length - 1);
            foreach (string eachExpression in fieldExpressions)
            {
                //parse key and value
                if (parseCookieField(eachExpression, out pair))
                {
                    // add to cookie field if possible
                    addFieldToCookie(ref ck, pair);
                }
                else
                {
                    // if any field fail, consider it is a abnormal cookie string, so quit with false
                    parsedOk = false;
                    break;
                }
            }
        }
        else
        {
            parsedOk = false;
        }

        return parsedOk;
    }//parseSingleCookie

    

            Cookie ck = new Cookie();
            // recover it back
            string recoveredCookieStr = Regex.Replace(cookieStr, @"xpires=\w{3}" + replacedChar + @"\s\d{2}-\w{3}-\d{4}", new MatchEvaluator(_recoverExpireField));
            if (parseSingleCookie(recoveredCookieStr, ref ck))
            {
                if (needAddThisCookie(ck, curDomain))
                {
                    parsedCookies.Add(ck);
                }
            }