Java Regular Expressions MCQ Questions

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Which method is used to find the next subsequence that matches the pattern in a regular expression in Java?

A) `contains()` B) `search()` C) `find()` D) `match()`

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Answer & Solution

Answer: Option C

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In a regular expression, what does the metacharacter `?` represent?

A) One or more occurrences of the preceding character or group B) Zero occurrences of the preceding character or group C) A fixed number of occurrences of the preceding character or group D) Zero or one occurrence of the preceding character or group

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Answer & Solution

Answer: Option D

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Which class is used to represent a compiled regular expression in Java?

A) `Pattern` B) `Matcher` C) `Regex` D) `String`

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Answer & Solution

Answer: Option A

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What is the purpose of the `matches()` method in Java regular expressions?

A) It splits the input into an array of substrings B) It replaces the matched text with a new text C) It searches for the first occurrence of the pattern D) It checks if the entire input sequence matches the pattern

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Answer & Solution

Answer: Option D

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In a regular expression, what does the metacharacter `|` represent?

A) Zero or more occurrences of the preceding character or group B) A word boundary C) Alternation, allowing a choice between two or more patterns D) A digit

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Answer & Solution

Answer: Option C

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In a regular expression, what does the metacharacter `d` represent?

A) Any special character B) Any digit C) Any whitespace character D) None of These

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Answer & Solution

Answer: Option B

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Which method is used to replace text that matches a regular expression in Java?

A) `replaceFirst()` B) `findAndReplace()` C) `replaceAll()` D) `replace()`

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Answer & Solution

Answer: Option C

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What does the character class `[A-Z]` match in a regular expression?

A) Any lowercase letter B) Any digit C) Any special character D) Any uppercase letter

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Answer & Solution

Answer: Option D

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In a regular expression, what does the metacharacter `s` represent?

A) Any whitespace character B) Any letter C) Any digit D) Any special character

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Answer & Solution

Answer: Option A

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Which method is used to split a string using a regular expression in Java?

A) `substring()` B) `join()` C) `concat()` D) `split()`

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Answer & Solution

Answer: Option D

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