capture crftoken

I am trying to capture crftoken. Below is the response :

{“CSRFToken”:“16286617022701TWzCQjV2K2l04dLVOdtGDP”}

Regex i am passing is below, but i am getting following error “regex(CSRFToken":"(.*?)).find.exists, found nothing
.check(regex({“CSRFToken”:"(.*?)"}).saveAs(“scCSRFToken”))