t");
    } else {
      cl.remove("webex-correct");
    }
  }

  // added regex bit
  if (cl.contains("regex")){
    answer_regex = RegExp(real_answers.join("|"))
    if (answer_regex.test(my_answer)) {
      cl.add("webex-correct");
    }
  }

  update_total_correct();
}

window.onload = function() {
  /* set up solution buttons */
  var buttons = document.getElementsByTagName("button");

  for (var i = 0; i < buttons.length; i++) {
    if (buttons[i].parentElement.classList.contains('webex-solution')) {
 