Pattern Syntax Checker HackerRank Solution

In this Java program, the user is asked to input a number of test cases, followed by that many strings. Each string is supposed to represent a regular expression pattern. The task is to check whether each string is a valid regular expression pattern or not.

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Here is the Pattern Syntax Checker HackerRank Solution HackerRank solution using CodeRankGPT:

The solution approach is straightforward. For each test case, the program reads a string and tries to compile it into a Pattern object using the Pattern.compile() method. If the string is a valid regular expression, the method will succeed and the program will print 'Valid'. If the string is not a valid regular expression, the method will throw an exception, which the program catches and then prints 'Invalid'.


/**
 * 
 */
package com.javaaid.hackerrank.solutions.languages.java.strings;

import java.util.Scanner;
import java.util.regex.Pattern;

/**
 *
 */
public class PatternSyntaxChecker {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int testCases = Integer.parseInt(in.nextLine());
		while (testCases-- > 0) {
			String pattern = in.nextLine();
			try {
				Pattern.compile(pattern);
				System.out.println("Valid");
			} catch (Exception e) {
				System.out.println("Invalid");
			}
		}
		in.close();
	}
}

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