如何从jmeter正则表达式中获取最后一个值？

Question

我使用具有以下配置的正则表达式来提取 id 值：

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

但我没有得到最后的价值我随机获得价值。请建议如何获取最后一个id值。

下面给出了响应，并希望从响应中提取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"}]

添加Beanshell后

Answer 1

A。如果您确定第N个元素（比如第4个）是last value every time，那么您可以hard code Match no. as 4中的值Regex: `"id":"(.*?)"\,"batch":{"id":"(.*?)"}` Template is `$1$` match value is -1 // to store all matched values 。

B。如果您不确定它是否总是Nth（4）元素，请按以下步骤操作：

在RegExExtractor中提及以下值：

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

将BeanShell PostProcessor作为子项添加到同一个采样器中，并添加以下代码：

${lastID}

您可以按如下方式引用最后一个值：

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

参考图片：

RegExExtractor：

BeanShell PostProcessor：

Answer 2

为什么不将响应解析为JSON对象？如果将来修改json对象，它将比使用正则表达式更易于维护。