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TwentyFive.java

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// Here's the complete code that checks whether the given regex pattern is valid by attempting to compile it using Pattern.compile():

package HackerRank;

import java.util.Scanner;

import java.util.regex.*;

public class TwentyFive {

public static void main(String[] args){

Scanner in = new Scanner(System.in);

if(!in.hasNextLine())

return;

int testCases = Integer.parseInt(in.nextLine());

while(testCases>0 && in.hasNextLine()){

String pattern = in.nextLine();

//Write your code

try {

Pattern.compile(pattern);

System.out.println("Valid");

} catch (PatternSyntaxException e) {

System.out.println("Invalid");

}

}

in.close();

}

}