Practice Problems - Write Code

Please answer the following problems to the best of your ability without any outside help. You can stop working on a problem after you worked on it for about four minutes without solving it.

Problems

Please write a regex that would match both word “gray” and “grey”. Replace “YOUR_REGEX” with your answer, but do not remove other symbols

import re def match_word(word): if re.match('^YOUR_REGEX$', word) != None: return True else: return False ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(match_word('gray'), True, 'Should match "gray"') self.assertEqual(match_word('grey'), True, 'Should match "grey"') self.assertEqual(match_word('gry'), False, 'Should not match "gry"') myTests().main()

Please write a regex that would match a word that starts with an uppercase letter and followed by at least one lowercase letters, like “Apple”, “Banana”, or “Carrot”. Replace “YOUR_REGEX” with your answer, but do not remove other symbols.

import re def match_word(word): if re.match('^YOUR_REGEX$', word) != None: return True else: return False ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(match_word('Apple'), True, 'Should match "Apple"') self.assertEqual(match_word('Banana'), True, 'Should match "Banana"') self.assertEqual(match_word('It'), True, 'Should match "It"') self.assertEqual(match_word('FRUIT'), False, 'Should not match "FRUIT"') self.assertEqual(match_word('vegetable'), False, 'Should not match "vegetable"') myTests().main()

Please write a regex to capture numbers with 5-7 digits. For example: 48105, 103028, 1234567. Replace “YOUR_REGEX” with your answer, but do not remove other symbols.

import re def match_number(word): if re.match('^YOUR_REGEX$', word) != None: return True else: return False ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(match_number('48105'), True, 'Should match "48105"') self.assertEqual(match_number('103028'), True, 'Should match "103028"') self.assertEqual(match_number('1234567'), True, 'Should match "1234567"') self.assertEqual(match_number('123'), False, 'Should not match "123"') self.assertEqual(match_number('12345678'), False, 'Should not match "12345678"') self.assertEqual(match_number('words'), False, 'Should not match "words"') myTests().main()

Capture words that start with a vowel (a, e, i, o, u), but end with a consonant (any letters that are not a, e, i, o, u). For example, it should match “unicorn”, “it”, and “element”. Replace “YOUR_REGEX” with your answer, but do not remove other symbols.

import re def match_word(word): if re.match('^YOUR_REGEX$', word) != None: return True else: return False ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(match_word('unicorn'), True, 'Should match "unicorn"') self.assertEqual(match_word('it'), True, 'Should match "it"') self.assertEqual(match_word('element'), True, 'Should match "element"') self.assertEqual(match_word('banana'), False, 'Should not match "banana"') self.assertEqual(match_word('apple'), False, 'Should not match "apple"') self.assertEqual(match_word('tick'), False, 'Should not match "tick"') myTests().main()

Please write a regex to replace the ‘YOUR_REGEX’ below to match any price in the form of $3.45 or $23.32 or $400. Note that we are using re.findall(), so please make sure your regex would return the full match string.

import re def find_price(content): return re.findall('YOUR_REGEX', content) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(find_price('The price of the apple is $3.45.'), ['$3.45'], 'The price of the apple is $3.45.') self.assertEqual(find_price('I spent $23.32 for the book.'), ['$23.32'], 'I spent $23.32 for the book.') self.assertEqual(find_price('The gift cost me $400, and the cake was $40.26.'), ['$400', '$40.26'], 'The gift cost me $400, and the cake was $40.26.') myTests().main()

Please write a regex to capture a URL that only consists of characters, numbers, underscore, and dots. For example: www.abc.com, def_ghi.com, a678.cn Note that dots(“.”) should not appear consecutively, and should not appear as the first or last character. The dot must appear at least once. Replace “YOUR_REGEX” with your answer, but do not remove other symbols.

import re def match_URL(content): if re.match('^YOUR_REGEX$', content) != None: return True else: return False ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(match_URL('www.abc.com'), True, 'Should match "www.abc.com"') self.assertEqual(match_URL('def_ghi.com'), True, 'Should match "def_ghi.com"') self.assertEqual(match_URL('a678.cn'), True, 'Should match "a678.cn"') self.assertEqual(match_URL('com'), False, 'Should not match "com"') self.assertEqual(match_URL('abc*.com'), False, 'Should not match "abc*.com"') self.assertEqual(match_URL('abc..com'), False, 'Should not match "abc..com"') myTests().main()

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