Extracting a Json Object as List(regex)

I had a JSON data like this:

"[{'3': 'test'}, {'4': 'testathira'}, {'5': 'Sample Test'}, {'6': 'XYZ'}]

I want to write a regex statement to get these object in array of the nested JSON object into python list:

Let's check regex101 with website:

https://regex101.com/r/0OhB7x/1/

To write pythonic code for the following:

import re
x = input()
re.findall(r"{'[0-9]+': '[a-z][A-Z]+'}", x)