validator.js

  validDatapoint: function(datapoint) {
    var re = /^\s*((?:(?:\d{1,2})\s+){1,3}|\^+\s+)((?:(?:\+|\-)?(?:\d+\.?\d*|\d*\.?\d+))|(?:\d+st[\d\.]*)|(?:(\d+)\:(\d\d)(?:\:(\d\d))?))(\s+\".*?\")?\s*$/;
    if(datapoint.length > 0 && !re.test(datapoint)) {
      return false;
    }
    else if (datapoint.match(re) &&
      ($.trim(datapoint.match(re)[1]) - 0 < 1 ||
      $.trim(datapoint.match(re)[1]) - 0 > 31)) {
      return false;
    }
    return true;
  }