Regex to extract UUID without key value in json - json

Question

I have below json from which I wants to extract '07199fca-b43f-4e58-b0fc-c1e254f34ac0' values. I got with multiple regex available in regex101 but every time I get all UUID value any way by which I get Unique value that has no json key assign.
JSON Syntax:
[
[
{
"clientId": 178,
"uniqueId": "5f7f919f-7e0f-4a1e-9a91-89b673896da6",
"displayName": "Automation Client Test",
"productVersion": "7.9.0.0"
},
{
"clientId": 1206,
"uniqueId": "096b3549-6899-4621-854c-e682aeb543bd",
"displayName": "TestClient1",
"productVersion": "7.9.0.0"
},
{
"clientId": 1356,
"uniqueId": "faad0e20-dd29-4146-8a8f-37648749aa4e",
"displayName": "Client Automation",
"productVersion": "7.9.0.0"
}
],
"07199fca-b43f-4e58-b0fc-c1e254f34ac0"
]

Answer 1

From your question it is not 100% clear what you are looking for, but if you are looking for the last element of the list that also satisfies [a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12} regex (with quotes around it), then:
(?:['"])([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})(?:['"]\s*]\s*$)
See Regex Demo
(?:['"]) Matches ' or ".
([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}) Your regex captured in capture group 1.
(?:['"]\s*]\s*$) Matches ' or " followed by 0 or more white space characters followed by a ] followed by 0 or more white space characters followed by the end of string.
The code:
import re
s = """ [
[
{
"clientId": 178,
"uniqueId": "5f7f919f-7e0f-4a1e-9a91-89b673896da6",
"displayName": "Automation Client Test",
"productVersion": "7.9.0.0"
},
{
"clientId": 1206,
"uniqueId": "096b3549-6899-4621-854c-e682aeb543bd",
"displayName": "TestClient1",
"productVersion": "7.9.0.0"
},
{
"clientId": 1356,
"uniqueId": "faad0e20-dd29-4146-8a8f-37648749aa4e",
"displayName": "Client Automation",
"productVersion": "7.9.0.0"
}
],
"07199fca-b43f-4e58-b0fc-c1e254f34ac0"
]"""
m = re.search(r"""(?:['"])([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})(?:['"]\s*]\s*$)""", s, flags=re.DOTALL|re.IGNORECASE)
if m:
print(m[1])
Prints:
07199fca-b43f-4e58-b0fc-c1e254f34ac0

Answer 2

JSON is a well-structured data, using regular expressions for parsing JSON is not the best idea, I would rather recommend going for JSON Extractor instead
The relevant JsonPath query would be as simple as $[1]
Demo:
More information: API Testing With JMeter and the JSON Extractor