Write a regular expression that matches violations of the old spelling rule "I before E except after C or when sounded like A as in neighbor or weigh" [14]: SPELL RE r'(71) (?!cie) ([a-z) |^)([^a-z]+)([ie]) (?! [a-z]}'" The following code block will test your regular expression by trying it against a bunch of strings. If your answer is correct it should pass 100% of the tests. [15]: Wipytest WRONG = ('peice', 'beleive', 'greif', 'cieling', 'recieve', 'wieght', 'frieght") RIGHT= ('piece', 'believe', 'grief, 'ceiling', 'receive', 'weight', 'freight") @pytest.mark.parametrize('text, is_error', [(x, True) for x in WRONG] + [(x, False) for x in RIGHT]) def test spell(text, is_error): assert bool(re.search(SPELL_RE, text)) == is_error