Hackerrank – Java Solution – Pattern Syntax Checker Solution

Hackerrank – Java Solution – Pattern Syntax Checker Solution

Problem Name –  Pattern Syntax Checker
Problem Link –   Pattern Syntax Checker 
Level – String
Point – 20

Java Code

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

public class Solution {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int testCases = scan.nextInt();
        scan.nextLine();
        
        // If a PatternSyntaxException is not thrown by Pattern.compile, the regular expresion is valid
        while (testCases-- > 0) {
           String pattern = scan.nextLine();
           try {
               Pattern.compile(pattern);
               System.out.println("Valid");
           } catch (PatternSyntaxException exception) {
               System.out.println("Invalid");
           }
        }
        scan.close();
    }
}

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