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import re
test_string = "test_string TEST_STRING TEST_string _TEST_STRING_ TESTSTRING ANOTHER_TEST_STRING"
p = re.compile(r"\b[A-Z]+_[A-Z_]*[A-Z]\b") 
print(re.findall(p,test_string))
Success #stdin #stdout 0.02s 27712KB
comments (?)
stdin 
Standard input is empty
stdout 
['TEST_STRING', 'ANOTHER_TEST_STRING']
https://ideone.com/Eio5Oi
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
public

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