java 正則匹配字符串

        String pattern = "(actId.*)";
        // 創建 Pattern 對象
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(string);
        String group="";
        if(m.find()){//調用group前 必須調用 find ?? 什麼鬼邏輯
            group = m.group(1);
        }
        group=group.replace("actId: \"","").replace("\",","");
        //System.out.println(group);


        String pattern0 = "(itemCode.*)";
        // 創建 Pattern 對象
        Pattern r0 = Pattern.compile(pattern0);
        Matcher m0 = r0.matcher(string);
        String group0="";
        if(m0.find()){//調用group前 必須調用 find ?? 什麼鬼邏輯
            group0 = m0.group(1);
        }
        group0=group0.replace("itemCode: \"","").replace("\",","");