Regular Expressions In Java — Part 1 MCQs with Explanations

A pattern that describes a set of strings is the correct answer to “What is a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`Pattern` is the correct answer to “Which class is used to compile a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any character is the correct answer to “In a regular expression, what does the metacharacter `.` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any uppercase or lowercase letter is the correct answer to “What does the character class `[A-Za-z]` match in a regular expression”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`+` is the correct answer to “Which quantifier is used in a regular expression to match one or more occurrences of the preceding character or group”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

The start of a line is the correct answer to “In a regular expression, what does the metacharacter `^` represent when used at the beginning of a pattern”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`Matcher` is the correct answer to “Which class is used to perform matching operations with regular expressions in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

The end of a line is the correct answer to “In a regular expression, what does the metacharacter `$` represent when used at the end of a pattern”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any digit is the correct answer to “What does the character class `[0-9]` match in a regular expression”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`find()` is the correct answer to “Which method is used to find the next subsequence that matches the pattern in a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`Pattern` is the correct answer to “Which class is used to represent a compiled regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

It checks if the entire input sequence matches the pattern is the correct answer to “What is the purpose of the `matches()` method in Java regular expressions”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any digit is the correct answer to “In a regular expression, what does the metacharacter `d` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`replaceAll()` is the correct answer to “Which method is used to replace text that matches a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any uppercase letter is the correct answer to “What does the character class `[A-Z]` match in a regular expression”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any whitespace character is the correct answer to “In a regular expression, what does the metacharacter `s` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`split()` is the correct answer to “Which method is used to split a string using a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

It returns the matched subsequence is the correct answer to “What is the purpose of the `group()` method in Java regular expressions”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Any word character (letter, digit, or underscore) is the correct answer to “In a regular expression, what does the metacharacter `w` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`appendReplacement()` is the correct answer to “Which method is used to append replacement text in a Java regular expression operation”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

A word boundary is the correct answer to “In a regular expression, what does the metacharacter `b` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

It returns a literal pattern string for the specified string is the correct answer to “What is the purpose of the `quote()` method in Java regular expressions”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

The beginning of a quoted section is the correct answer to “In a regular expression, what does the metacharacter `Q` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

`CharacterGroup` is the correct answer to “Which class is used to represent a group of characters in a regular expression in Java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

The beginning of a string is the correct answer to “In a regular expression, what does the metacharacter `A` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

It resets the matcher is the correct answer to “What is the purpose of the `reset()` method in Java regular expressions”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

The end of the previous match is the correct answer to “In a regular expression, what does the metacharacter `G` represent”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

03:55:04 is the correct answer to “What will be the output of the following Java program? import java.text.*; import java.util.*; class Date_formatting { public static void main(String args[]) { Date date = new Date(); SimpleDateFormat sdf; sdf = new SimpleDateFormat("hh:mm:ss"); System.out.print(sdf.format(date)); } } Note : The program is executed at 3 hour 55 minutes and 4 sec (24 hours time).”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

offset from last character of the subsequent group is the correct answer to “What does public int end(int group) return”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

interpreted both pattern and performs match operations in the string is the correct answer to “What is the significance of Matcher class for regular expression in java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

group 0 is the correct answer to “Which capturing group can represent the entire expression”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

\z is the correct answer to “Which of the following matches end of the string using regular expression in java”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

a is the correct answer to “Which of these formatting strings of SimpleDateFormat class is used to print AM or PM in time”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Regex class is the correct answer to “Which of the following is not a class of java.util.regex”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

Mon Jul 15 2013 is the correct answer to “What will be the output of the following Java program? import java.text.*; import java.util.*; class Date_formatting { public static void main(String args[]) { Date date = new Date(); SimpleDateFormat sdf; sdf = new SimpleDateFormat("E MMM dd yyyy"); System.out.print(sdf.format(date)); } } Note: The program is executed at 3 hour 55 minutes and 4 sec on Monday, 15 July(24 hours time).”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

returns start index of the previous match is the correct answer to “What does public int start() return”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

True is the correct answer to “groupCount reports a total number of Capturing groups.”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

java.text is the correct answer to “Which of these package is used for text formatting in Java programming language”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

55:03:04 is the correct answer to “What will be the output of the following Java program? import java.text.*; import java.util.*; class Date_formatting { public static void main(String args[]) { Date date = new Date(); SimpleDateFormat sdf; sdf = new SimpleDateFormat("mm:hh:ss"); System.out.print(sdf.format(date)); } } Note : The program is executed at 3 hour 55 minutes and 4 sec (24 hours time).”. This question is standard in competitive examination syllabi for Regular Expressions In Java.

DateFormat is the correct answer to “Which of this class can be used to format dates and times”. This question is standard in competitive examination syllabi for Regular Expressions In Java.