How to select single value from large response string?

Hi,

To extract the particular value, you'll need to use regex.
The value can be validated using script assertion.
Write a simple code in groovy in that script assertion.
Here is a sample:

def response = <using get data, take the response string here>
def eventId = response.split("EventId>")[1].replaceAll("<","").replaceAll("////","")

//it will return the value of eventId
// now assert with the desired value

assert eventId == <desired value>

Hope it helps.

Regards,
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