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:
To write pythonic code for the following:
import re
x = input()
re.findall(r"{'[0-9]+': '[a-z][A-Z]+'}", x)