Hackerrank Pattern Syntax Checker Solution
1 min read

Hackerrank Pattern Syntax Checker Solution

Hackerrank Pattern Syntax Checker Solution

Using Regex, we can easily match or search for patterns in a text. Before searching for a pattern, we have to specify one using some well-defined syntax.

In this problem, you are given a pattern. You have to check whether the syntax of the given pattern is valid.

Note: In this problem, a regex is only valid if you can compile it using the  Pattern.compile method.

Input Format

The first line of input contains an integer , denoting the number of test cases. The next  lines contain a string of any printable characters representing the pattern of a regex.

Output Format

For each test case, print Valid if the syntax of the given pattern is correct. Otherwise, print Invalid. Do not print the quotes.

Sample Input

3
([A-Z])(.+)
[AZ[a-z](a-z)
batcatpat(nat

Sample Output

Valid
Invalid
Invalid

Solution in java8

import java.util.Scanner;
import java.util.regex.*;

public class Solution
{
   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(PatternSyntaxException e) {
                System.out.println("Invalid");
            }

            testCases--;
        }
   }
}

Enjoying these posts? Subscribe for more


Adblocker detected! Please consider reading this notice.

We've detected that you are using AdBlock Plus or some other adblocking software which is preventing the page from fully loading.

That's okay. But without advertising-income, we can't keep making this site awesome.

We don't have any banner, Flash, animation, obnoxious sound, or popup ad. We do not implement these annoying types of ads!

We need money to operate the site, and almost all of it comes from our online advertising.

Please add thepoorcoder.com to your ad blocking whitelist or disable your adblocking software.

×