如何从jmeter正则表达式中获取最后一个值？

Question

我用正则表达式具有以下配置提取ID值：

Regex: `"id":"(.*?)"\,"batch":{"id":"(.*?)"}` 
Template is `$1$` 
match value is `N` 

，但我没有得到最后的值我一个随机的基础上获得的价值。请建议如何获取最后的id值。下面

的响应被给出，并希望提取从响应N1600-2016-11-18-1479503469487值。

14T21:00:00Z","version":1479157741885,"recordCount":92054,"statusIdentifier":"END"},{"id":"N1600-2016-11-15-1479244284441","batch":{"id":"N1600"},"asOf":"2016-11-15T21:00:00Z","runDate":"2016-11-15T21:00:00Z","version":1479244284441,"recordCount":91838,"statusIdentifier":"END"},{"id":"N1600-2016-11-16-1479330679449","batch":{"id":"N1600"},"asOf":"2016-11-16T21:00:00Z","runDate":"2016-11-16T21:00:00Z","version":1479330679449,"recordCount":91796,"statusIdentifier":"END"},{"id":"N1600-2016-11-17-1479417271814","batch":{"id":"N1600"},"asOf":"2016-11-17T21:00:00Z","runDate":"2016-11-17T21:00:00Z","version":1479417271814,"recordCount":91761,"statusIdentifier":"END"},{"id":"N1600-2016-11-18-1479503469487","batch":{"id":"N1600"},"asOf":"2016-11-18T21:00:00Z","runDate":"2016-11-18T21:00:00Z","version":1479503469487,"recordCount":91693,"statusIdentifier":"END"}] 

增加BeanShell的

Answer 1

你为什么不解析响应为JSON对象后？如果将来您的json对象被修改，它将比使用正则表达式更易于维护。

Answer 2

A.如果您确定第N个元素（比如4日）是last value every time，那么您可以在Match no. as 4hard code值。

B.如果你不知道它始终是第N（4）元素，那么就如下：

以下提及在RegExExtractor值：

Regex: `"id":"(.*?)"\,"batch":{"id":"(.*?)"}` 
Template is `$1$` 
match value is -1 // to store all matched values 

添加的BeanShell PostProcessor中作为一个孩子相同的采样，并添加以下代码：

int size = Integer.parseInt(vars.get("ID_matchNr")); // to get size of matched values 
log.info("size:" + size); // you can remove log stmts once it is working 
String newId = "ID_" + size; 
String lastId = vars.get(newId); // to retrieve the value 
log.info("last id: " + lastId); 
vars.put("lastID", lastId); // to store the value 

你可以参考的最后一个值，如下所示：

${lastID} 

参考图片：

RegExExtractor：

的BeanShell PostProcessor中：