How to extract value from Regular Expression Extractor for requests in loop and pass these as comma separated in the subsequent request?

Question

I have two requests:

• The first one is in a loop controller with the count as 4. I have implemented a Regular Expression Extractor for this request.
• The second request is outside loop and this consumes the value extracted via the Regular Expression Extractor reference name.
• I have given the reference name comma separated but it just takes the same value extracted from the 4th loop of the first aforementioned request.
• How can I have all four different values extracted and passed as comma separated in the second request that resides outside loop?

Answer 1

1. Add JSR223 PostProcessor after the Regular Expression Extractor

2. Put the following code into "Script" area:

   def myVar = vars.get('foo')
   if (myVar == null) {
      myVar = ''
   }
   myVar += vars.get('your_var_from_regex') + ','
   vars.put('foo', myVar)
   

3. Replace your_var_from_regex with the Reference Name of the JMeter Variable you defined in the Regular Expression Extractor
4. You will be able to refer concatenated, comma-separated value as ${foo} where required.

Example test plan structure:

More information: Apache Groovy - Why and How You Should Use It