What does the Pattern class in Java represent?
It is a class that provides methods to match regular expressions
It is a class that stores strings for future matching
It is a class used to compile a regular expression into a pattern object
It is a class used to represent strings without any pattern matching
Which of the following is a method of the Matcher class used to check if a string matches the pattern?
Consider the following code snippet. What will be the output of this code?
Java
import java.util.regex.*;
public class Main {
public static void main(String[] args) {
String regex = "a*b";
String input = "aaab";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
System.out.println(matcher.matches());
}
}
What does the find() method of the Matcher class do?
It checks if the entire string matches the pattern
It finds the next occurrence of the pattern in the input string
It replaces the matched string with another string
It splits the string based on the regular expression
Which of the following regular expression patterns represents a digit in Java?
Which regular expression correctly matches a valid IPv4 address (e.g., "192.168.1.1") in Java?
\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}
[0-9]{3}\\.[0-9]{3}\\.[0-9]{3}\\.[0-9]{3}
(\\d+\\.\\d+\\.\\d+\\.\\d+)
\\d{1,3}\\,\\d{1,3}\\,\\d{1,3}\\,\\d{1,3}
How do you escape special characters in a Java regular expression?
By using the backslash (\)
By using double backslash (\\)
By using a Matcher object
Which of the following will match a string that starts with a digit followed by any number of lowercase letters?
What is the purpose of the Pattern.compile() method in Java regex?
It matches a string with the provided pattern
It creates a new Matcher object from a regular expression pattern
It converts a regular expression into a human-readable format
It compiles a string into a regular expression pattern object
Consider the following regular expression pattern \\w+. What will it match?
One or more word characters (letters, digits, and underscores)
One or more non-word characters
Any character except a word character
Zero or more word characters
There are 10 questions to complete.
Take a part in the ongoing discussion
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4