JMeter starts from zero (III) -- simple use of regular expressions

This paper introduces Jmter When sending a request , A common situation ：

Suppose we need to send a request , This request requires a parameter , But this parameter is not fixed , He was the last one who asked to return , And it's different every time I return , What should we do at this time ？

First , We create a HTTP Request , That is, pre request , The method is the same as that introduced in the previous article , Add thread group , establish HTTP request , Add view result tree , Then start

Pictured , This is the result of our pre request , For example, we need to use the one marked in the red box for our next request ID：13010051

First, we create a regular expression extractor in this request

  Then return to the result tree just now , Left selection is RegExp Tester, In this way, the view on the right side is more organized , then , image Loadrunner Left and right boundary values , Paste the left and right parameters we need into the text box below , Then we use the part we need （.*？） Instead of

  Be careful ： Not all of them should be used （.*？） Instead of , Here are the rules ：

How to check whether we can get the right value by writing like this ？  On the right side of the text box is a test Button , Click to view the sampling results ：

  It's the same as we expected , Here we are 13010051, Then we paste the contents of the text box into the regular expression sampler .

  There's a pit here , It's the template. , Don't write nonsense , Don't forget to write , Here are the following rules ：

For example, we need to take values in the following responses ：

"HeatPowerPlantID":"A","HeatPowerPlantName":"jmeter test "."HeatPowerPlantID":"B","HeatPowerPlantName":"jmeter test ".

Regular expression extractor template , Style is ：$n$.

If the template is ：$0$, Is what the entire expression matches , It includes the contents inside and outside the parentheses , The value obtained is the whole content , namely ：

"HeatPowerPlantID":"A","HeatPowerPlantName":"jmeter test "."HeatPowerPlantID":"B","HeatPowerPlantName":"jmeter test ".

If the template is ：$1$, Then it corresponds to the first (.*?) What matches , namely   A

If the template is ：$2$, Then it corresponds to the second in the regular expression (.*?) What matches , namely   B

If the template is $1$$2$, Then put 2 individual (.*?) The matched content is spliced , namely AB.

Templates can be combined freely , In the following cases .

Now our regular expression is done , How to use the next request , We create the next HTTP request , And add parameters ：

  The parameters we get a , As the parameter of the next request , The name of this parameter is heatPowerPlantIDs, Its value is in our regular expression a, It is written here as ：＄{a}

So far, parameterization is completed ,PS： comparison loadrunner Parametric Association of ,Jmeter I feel a little troublesome , But the principle is the same , The parameter position is determined by the left and right boundary values , And then take .

Then we click Run , You can see in the result tree , The request is successful , We successfully deleted ID by 13010051 The data of