Regex JSON response Gatling stress tool

Question

Wanting to capture a variable called scanNumber in the http response loking like this:

{"resultCode":"SUCCESS","errorCode":null,"errorMessage":null,"profile":{"fullName":"TestFirstName TestMiddleName TestLastName","memberships":[{"name":"UA Gold Partner","number":"123-456-123-123","scanNumber":"123-456-123-123"}]}}

How can I do this with a regular experssion? The tool I am using is Gatling stress tool (with the Scala DSL)

I have tried to do it like this:

.check(jsonPath("""${scanNumber}""").saveAs("scanNr")))

But I get the error:

---- Errors --------------------------------------------------------------------
> Check extractor resolution crashed: No attribute named 'scanNu      5 (100,0%)
mber' is defined

Answer 1

You were close first time.

What you actually want is:

.check(jsonPath("""$..scanNumber""").saveAs("scanNr")))

or possibly:

.check(jsonPath("""$.profile.memberships[0].scanNumber""").saveAs("scanNr")))

Note that this uses jsonPath, not regular expressions. JsonPath should more reliable than regex for this.

Check out the JsonPath spec for more advanced usage.

Answer 2

use this regex to match this in anywhere in json:

/"scanNumber":"[^"]+"/

and if you want to match just happens in structure you said use:

/\{[^{[]+\{[^{[]+\[\{[^{[]*("scanNumber":"[^"]+")/

Answer 3

Since json fields may change its order you should make your regex more tolerant for those changes:

val j = """{"resultCode":"SUCCESS","errorCode":null,"errorMessage":null,"profile":{"fullName":"TestFirstName TestMiddleName TestLastName","memberships":[{"name":"UA Gold Partner","number":"123-456-123-123","scanNumber":"123-456-123-123"}]}}"""
val scanNumberRegx = """\{.*"memberships":\[\{.*"scanNumber":"([^"]*)".*""".r
val scanNumberRegx(scanNumber) = j

scanNumber //String = 123-456-123-123

This will work even if the json fields will be in different order (but of course keep the structure)