RegEx Gmail Filter

README.md

1. Creat google developer profile https://developers.google.com/profile/u/me/dashboard

2. Enable advanced google services https://developers.google.com/apps-script/guides/services/advanced

3. Enable advanced services https://developers.google.com/apps-script/guides/services/advanced#enable_advanced_services

   3.1. Create a apps script project https://developers.google.com/apps-script

   3.2. Goto app script project and create script https://script.google.com/home

   3.3 Add your code API reference: https://developers.google.com/apps-script/reference/gmail/gmail-app#movethreadtoarchivethread https://support.google.com/mail/answer/7190?hl=en

   3.4 Create a trigger which executes according your time

Reference link: https://www.jessespevack.com/2018-09-06-how-to-create-a-gmail-filter-with-google-apps-script/

filterEmails.js

function filterTestMail() {

  // Make this function trigger every 5 min so that it will have to only get last 1 hour emails.

  const LABEL_NAME = 'Guest';
  const emailPattern = /^pradeep\.tammali\+fakedata[0-9]*@oneflow\.com$/;
  try {
    no_label = true;
    labels = GmailApp.getUserLabels();
    for (var i = 0; i < labels.length; i++) {
      if (labels[i].getName() == LABEL_NAME) {
        no_label = false;
      }
    }

    // Create lable if doesn't exist
    if (no_label == true) {
      GmailApp.createLabel(LABEL_NAME);
    }
    const FILTER_LABEL = GmailApp.getUserLabelByName(LABEL_NAME);


    // Get the yesterday date
    // var yesterdayDate = (new Date().getDate() - 1).toString();
    
    // let today = new Date();
    // let after = new Date(today);
    // after.setDate(after.getDate() - 1);
    // var afterDate = after.toLocaleDateString();
    
    // let yesterdayFormatted = yesterday.getFullYear() + '/' + (yesterday.getMonth() + 1).toString().padStart(2, '0') + '/' + yesterday.getDate().toString().padStart(2, '0');
    // In MM/DD/YYYY format
    

    // Get all the emails since yesterday
    // var mails = GmailApp.search("in:anywhere after:" + afterDate);

    // Get mails newer than 1 hour
    var mails = GmailApp.search("in:anywhere newer_than:1h");

    // Get mails newer than 1 day
    // var mails = GmailApp.search("in:anywhere newer_than:1d");
    if (mails.length > 0) {
      for (var t = mails.length - 1; t >= 0; t--) {
        var thread = mails[t];
        var message = thread.getMessages()[0];
        var toAddress = message.getTo();
        if (emailPattern.test(toAddress)) {
          thread.addLabel(FILTER_LABEL);
          GmailApp.moveThreadToArchive(thread);
        }
      }
    }
  } catch (e) {
    Logger.log(e.toString());
  }
}