code: public static void main(String[] args) {
          Scanner scan = new Scanner(System.in);
  
          RegularExpression<String> regex = RegularExpressionParsers.word.parse(args[0]);
          System.out.println("regex: " + regex);
          System.out.println();
  
          while (scan.hasNextLine()) {
              String line = scan.nextLine();
  
              System.out.println("contains: " + regex.apply(Arrays.asList(line.split("\\s+"))));
              System.out.println("matches:  " + regex.matches(Arrays.asList(line.split("\\s+"))));
              System.out.println();
          }
  
          scan.close();
      }
docs: An interactive program that compiles a word-based regular expression
  specified in arg1 and then reads strings from stdin, evaluating them
  against the regular expression.
  @param args