java截取兩個字符串之間的字符

/**
     * 返回單個字符串，若匹配到多個的話就返回第一個，方法與getSubUtil同樣
     *
     * @param soap
     * @param rgex
     * @return
     */
    public static String getSubUtilSimple(String soap, String rgex)
    {
        Pattern pattern = Pattern.compile(rgex);// 匹配的模式
        Matcher m = pattern.matcher(soap);
        while (m.find())
        {
            return m.group(1);
        }
        return "";
    }
    public static void main(String[] args)
    {
        String origin = "action.VenderAction$$EnhancerBySpringCGLIB$$4770aa03.update()";
        origin = origin.replace(getSubUtilSimple(origin, "Action(.*?)\\."), "");
        System.out.println(origin);
    }