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hackerrank.comIncorrect RegexProblem link : https://www.hackerrank.com/challenges/incorrect-regex/problemDifficulty : Easy TipProblem ask how to validate regular expressionJust call re.compile(), it will raise exception if the given regular expression is not valid Solution import re cnt = int(input()) for _ in range(cnt): try: re.compile(input()) print(True) except: print(False)