try{
            Pattern.compile(pattern);
            System.out.println("Valid");
        }
        catch (PatternSyntaxException pe){      //patternSytaxException Handled.
            System.out.println("Invalid");
        }
        testCases --;   //Reduce value by 1
    }

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