Many of them asked us how to speed up JMeter. This is mainly used when we need to parse the text and apply it dynamically to subsequent threads in our test plan.We’ve often heard complaints about JMeter load testing performance from testing specialists and developers. JMeter regular expression extractor has even more powerful feature: the ability to create/use groups in the regex, capturing the portions of matches. Using this, we can store a value in a variable that can be used as references in other threads of the test plan. The regular expression extractor in JMeter is one of the significant features that will help us parse various types of values with different types of response indicators. Now, using this regex expression extractor the value has been captured from previous sampler and used in the current sampler. So, the View State value is passed to the corresponding field where dynamic value is generated. The value is the token that we have extracted.
When we look at the output of Debug Sampler response data, it shows our variable C_ViewState_1. So, we are adding a View results tree listener by right clicking on Thread group Select Add à listener à View Result Tree. Then, we need to view and verify test results using View Results Tree Listener. Since we want to debug the generated variables, set the JMeter variables field to True. Right click on Thread Group and Select Add à Sampler à Debug Sampler To add the Debug sampler, we should use these steps. This will help us understand whether our regex successfully matched with the expression created or failed to match. Before doing that, we should also need to add a Debug Sampler that will help us to check the variable and its value generated upon executing the test. We need to configure the View Results Tree Listener to the view the test results. So, this field will capture the exact value using regex extractor and populate it in the field. Reference Name: This is the main field where we can have the name of the variable which can further be referenced in the test plan using $ will be added to a field. The main thing is we can also parse URL using regex or we can opt them to apply regex on response code. We can always apply regex to plain response body or a document which will return as a response data. We have various response indicators or fields available to choose. So, we need to choose what kind of response should match. A user has the option to apply regex to main sample or sub samples or both.įield to Check: Regex will always be applied to the response data. Main sample is the response from the primary request and sub sample will be the sub sample. Below is the image of the Regular Expression Extractor control panel.Īpply to: Regex extractor are applied to test results which is a response data from the server. Let us see them in detail each one of them. The Regular expression extractor fields will allow us to configure the below fields.
The matched expression derived on applying the regex can then be used in a different sampler dynamically in the test plan execution. Regular Expression Extractor is a post processor that can be used to apply regex on response data. We can use regex to extract values from the response during test execution, store it in a variable (also called as reference name) and can use further in JMeter. Regular Expression (regex) feature in JMeter is developed and provided by the Jakarta ORO framework. (matches any single character), (matches any one character), ^ (matches the start position), $ (matches the end position) and many more to devise a search pattern. The language of regex uses meta characters like. Regular expression will be called as Regex in short. So, the same pattern will be applied on strings to find and extract the match required.
This will be written in a series of characters that will denote a search pattern. Regular Expression in general is a piece of sequence of symbols and characters which expresses a string or pattern to be searched for within a longer piece of text. In this article, we are going to see about the use of Regular Extractor Post Processor in JMeter. The tool supports testing both client-server and web applications that contain both static and dynamic resources even though this tool is considered as a standalone in nature. Apache JMeter is an open source Java based tool which is mainly used for performing Load testing/Performance testing.