Regular Expressions in Ruby MCQ question and answer with solution

1

What does the =~ operator do in Ruby when used with regular expressions?

A) Evaluates the regular expression B) Compares two regular expressions C) Matches a string against a regular expression D) Assigns a regular expression to a string

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Answer & Solution

Answer: Option C

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2

Which method is used to find the first occurrence of a pattern in a string in Ruby?

A) String#search B) String#find C) String#find_pattern D) String#match

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Answer & Solution

Answer: Option D

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3

What does the /\A anchor represent in a regular expression in Ruby?

A) Matches one or more occurrences of the previous character B) Matches any character except a newline C) Matches the start of a string D) Matches the end of a string

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Answer & Solution

Answer: Option C

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4

What is the purpose of the + quantifier in a regular expression in Ruby?

A) Matches zero or one occurrence of the preceding character B) Matches zero or more occurrences of the preceding character C) Matches exactly n occurrences of the preceding character D) Matches one or more occurrences of the preceding character

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Answer & Solution

Answer: Option D

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5

Which modifier is used to perform case-insensitive matching in Ruby regular expressions?

A) i B) m C) x D) o

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Answer & Solution

Answer: Option A

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6

What does the \d character class represent in a regular expression in Ruby?

A) Matches any word character B) Matches any whitespace character C) Matches any non-digit character D) Matches any digit character

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Answer & Solution

Answer: Option D

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7

Which metacharacter is used to specify optional characters in a regular expression in Ruby?

A) * B) + C) ? D) .

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Answer & Solution

Answer: Option C

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8

What does the ^ anchor represent in a regular expression in Ruby?

A) Matches the start of a string B) Matches the start of a line C) Matches the end of a string D) None of the above

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Answer & Solution

Answer: Option B

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9

Which method is used to replace occurrences of a pattern in a string with a specified string in Ruby?

A) String#modify B) String#sub C) String#gsub D) String#replace

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Answer & Solution

Answer: Option C

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10

What does the \s character class represent in a regular expression in Ruby?

A) Matches any non-whitespace character B) Matches any digit character C) Matches any word character D) Matches any whitespace character

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Answer & Solution

Answer: Option D

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Regular Expressions in Ruby MCQ question and answer with solution | Ruby Programming MCQs