I have to record a large test plan including 4 transactional controllers and response assertions for the UI side but at the time of login there is token generated and I am doing correlation manually.

I have used the regular expression extractor to extract the token from my login response but it gives the following error:

org.apache.oro.text.MalformedCachePatternException: Invalid expression: (?<=("|')token("|'):("|'))(.*?)("|')(=?) Sequence (?<...) not recognized.

Please guide me also how can testplanI pass this TOKEN on the further request as each request has its own header manager. How I can pass THIS TOKEN OVER 4 TRANSACTIONAL CONTROLLER. I am adding my test plan for reference. Please guide me on a suitable process to do this.

1 Answer 1


The exception clearly states that Sequence (?<...) not recognized

As per jmeter documentation https://jmeter.apache.org/usermanual/regular_expressions.html, Lookbehind expression (?<=) is not supported.

enter image description here

So use:


Here we have 5 groups, the actual token is in the 4th group and to get just the token value set template field as: $4$

enter image description here

  • Thanks, it works
    – coder_m
    Dec 15, 2019 at 4:39
  • @coder_m please accept the answer and upvote. Just click up arrow and tick
    – PDHide
    Dec 15, 2019 at 10:47
  • Can you bit help me out t, how do I pass this extracted token in further requests as it is testing of UI side and there are a lot of HTTP requests recorded with their header manager so I have to pass this request in all subsequent requests and by adding just one header manager over the controller does not do the work. it gives 401 unathorized
    – coder_m
    Dec 15, 2019 at 13:50
  • blogs.quovantis.com/…
    – PDHide
    Dec 15, 2019 at 14:23
  • See if this help , I am not sure about other answers has haven't worked much on it
    – PDHide
    Dec 15, 2019 at 14:29

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