Regular Expressions in Python

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In the functions re.search.start(group) and re.search.end(group), if the argument groups not specified, it defaults to . . . . . . . .

A) Zero B) None C) One D) Error

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Answer & Solution

Answer: Option A

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What is a character class in regular expressions?

A) A set of characters enclosed in square brackets that matches any character in the set B) A built-in function C) A specific character D) A special data type

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Answer & Solution

Answer: Option A

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What will be the output of the following Python code?

re.split(r'(a)(t)', 'Maths is a difficult subject')

A) ['M a t h s i s a d i f f i c u l t s u b j e c t'] B) ['Maths', 'is', 'a', 'difficult', 'subject'] C) Maths is a difficult subject' D) ['M', 'a', 't', 'hs is a difficult subject']

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Answer & Solution

Answer: Option D

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What will be the output of the following code:

import re
pattern = re.compile(r'b[A-Z]+b')
result = pattern.findall('Hello, WORLD!')
print(result)

A) ['Hello', 'WORLD'] B) An error will occur C) ['Hello,', 'WORLD!'] D) ['H', 'W']

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Answer & Solution

Answer: Option A

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What will be the output of the following Python code?

n = re.sub(r'\w+', 'Hello', 'Cats and dogs')

A) Hello
Hello
Hello B) ‘Hello Hello Hello’ C) [‘Hello’, ‘Hello’, ‘Hello’] D) (‘Hello’, ‘Hello’, ‘Hello’)

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Answer & Solution

Answer: Option B

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What is the purpose of the re.sub() function in Python?

A) It replaces occurrences of a pattern with a specified string B) It converts strings to regular expressions C) It searches for a match anywhere in the string D) It checks if a string contains a specific character

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Answer & Solution

Answer: Option A

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What is the purpose of the re.MULTILINE flag in Python?

A) It makes the ^ and $ characters match the beginning and end of each line B) It compiles a regular expression C) It converts strings to regular expressions D) It specifies a starting position

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Answer & Solution

Answer: Option A

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The difference between the functions re.sub and re.subn is that re.sub returns a . . . . . . . . whereas re.subn returns a . . . . . . . .

A) string, list B) list, tuple C) string, tuple D) tuple, list

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Answer & Solution

Answer: Option C

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What will be the output of the following Python code?

re.split('mum', 'mumbai*', 1)

A) Error B) [", 'bai*'] C) [", 'bai'] D) ['bai*']

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Answer & Solution

Answer: Option B

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The special character B matches the empty string, but only when it is . . . . . . . .

A) at the beginning or end of a word B) not at the beginning or end of a word C) at the beginning of the word D) at the end of the word

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Answer & Solution

Answer: Option B

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