Gmailに来るConnpass通知をいい感じにSlackに通知する ref: https://qiita.com/k_keisuke/items/072086fa760300ac060b

file0.txt

      var messages = thread.getMessages();
      var message = messages[0];
      var subject = message.getSubject();
      var body = message.getBody();

      var url = body.match(/<a href="https:\/\/.+\.connpass\.com\/event\/.+\/.+utm_content=detail_btn"/);
      if(url != null) {
        url = url[0].substring('<a href="'.length, url[0].lastIndexOf('/') + 1);

        var msg = "*" + subject + "* \n" + url;
        postToSlack(msg);
      }