JMeter not accepting Valid Regex, causing nothing to be posted

Question

I'd like to prefix this question with the fact that i'm a novice when it comes to Jmeter and Regex.

I have created a test plan for an ASP .Net application, which consists of a GET request, with a Regular expression extractor to grab a token, then a POST request, with a RegEx User Parameter to take the extracted token and use it in the request:

In the get request's respnse, there is a value of __RequestVerificationToken, which i am capturing with the following Regex (tested in tree Listner and is Validated):

(?<=Set-Cookie: __RequestVerificationToken=).{108}

So, it looks for "__RequestVerificationToken=" then gets the 108 characters after it.

Regular expression extractor:

Parameters in POST Request:

The RegEx user parameter i'm using is:

But when i run the test, the request post data returns:

I've used https://www.regextester.com/ for testing my RegEx and it correctly gets the token, so i'm wondering if JMeter just doesn't accept this?

Note: apologies for using images rather than text, i couldn't think of a good way to show the data.

Answer 1

It looks like your __RequestVerificationToken comes as a HTTP Cookie hence it makes sense to use HTTP Cookie Manager

1. Add the next line to user.properties file (lives in "bin" folder of your JMeter installation)

   CookieManager.save.cookies=true
   

2. Add HTTP Cookie Manager to your Test Plan
3. That's it, now you can access the token value as ${COOKIE____RequestVerificationToken} where required

Check out HTTP Cookie Manager Advanced Usage - A Guide article for more information

Answer 2

Can you try this for regex:

__RequestVerificationToken=(.+?);

Answer 3

It appears that you are expecting a valid JSON, so instead of RegEx, you could use JSON Extractor and/or JSON Assertion, for which extra spacing will not matter.

Example if response data is

{"RequestVerificationToken":"12345"}

and specify JSON extractor and place under the HTTP Header manager and send JSON path as $.RequestVerificationToken and you got the result variable RequestVerificationToken with Expacted value.