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better approach rather than consuming empty line using nextLine()
publicstaticvoidmain(String[]args){Scannerin=newScanner(System.in);inttestCases=Integer.parseInt(in.nextLine());while(testCases>0&&in.hasNext()){Stringpattern=in.nextLine();//Write your codetry{Patternpattern2=Pattern.compile(pattern);System.out.println("Valid");}catch(Exceptionex){System.out.println("Invalid");}}in.close();}
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better approach rather than consuming empty line using nextLine()