Pattern Syntax Checker Solution

 

Pattern Syntax Checker 

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

while(testCases>0){
            String pattern = in.nextLine();
            try {
                if (Pattern.compile(pattern) != null) {
                     System.out.println("Valid");
                } else {
                     System.out.println("Invalid");
                }
            } catch(Exception e) {
                    System.out.println("Invalid");
                }
            testCases--;
        }