Correlation (with Regular Expression Extractor):
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What is Correlation?
The process of extracting some value from the response of a step and referred it into the request of other subsequent step is called correlation.
Why is it required?
in a test there may be a need to refer values from earlier steps which cannot be determined prior to test execution as these are generated at runtime.
How to use Regular Expression Extractor
Step 1 : Create a Test Plan where you want to do dynamic referencing in JMeter
Step 2 : Add Regular Expression Extractor in the Step from where response value(s) needs to be extracted
Step 3 : Refer the extracted value (referred by Reference Name) into a subsequent step
Step 4 : Run and validate