@MitSM
I have worked on query, you have posted.Please go through the details below hope it serves the purpose.
Regex I wrote was:
(?m)"category61B" : \[ "(.*)\"\,\n "(.*)\"\, "(.*)\"\,\n "(.*)"\, "(.*)" \]\,
- I have validated the above regex on regex101, please find attached:"Regex_1"
- I have also executed it on Jmeter using jp@gc - Dummy Sampler and response you have provided.Refer post execution result :"Result" and you can utilize individual groups viz. categoryId_g1,categoryId_g2,categoryId_g3 etc. for every value inside the square brackets without ".