function DMMEnglish() {
  var criteria = "from:info@mail.dmm.com レッスン予約完了";
  eachUnreadMessage(criteria, function (message) {
    var body = message.getBody();
    var [matched, year, month, day] = /ご予約日：(\d+)年(\d\d)月(\d\d)日/.exec(body);
    var [matched, sh, sm] = /開始時間：(\d\d)時(\d\d)分/.exec(body);
    var [matched, teacher] = /講師名：([^\n]+)/.exec(body);
    var sdate = new Date(year, month-1, day, sh, sm);
    var edate = new Date(sdate.getTime() + 30 * 60000);
    createEvent("DMM英会話 " + teacher + "先生", sdate, edate);
  }
  );
}