Regex: Um GAS para pesquisa com RegEx no Gmail

function Search() {var sheet   = SpreadsheetApp.getActiveSheet();var row     = 2;    // Clear existing search results sheet.getRange(2, 1, sheet.getMaxRows() - 1, 4).clearContent();// Which Gmail Label should be searched?var label   = sheet.getRange("F3").getValue();// Get the Regular Expression Search Patternvar pattern = sheet.getRange("F4").getValue();    // Retrieve all threads of the specified labelvar threads = GmailApp.search("in:" + label);      for (var i = 0; i < threads.length; i++) {        var messages = threads[i].getMessages();        for (var m = 0; m < messages.length; m++) {     var msg = messages[m].getBody();      // Does the message content match the search pattern?     if (msg.search(pattern) !== -1) {       // Format and print the date of the matching message      sheet.getRange(row,1).setValue(       Utilities.formatDate(messages[m].getDate(),"GMT","yyyy-MM-dd"));       // Print the sender's name and email address      sheet.getRange(row,2).setValue(messages[m].getFrom());               // Print the message subject      sheet.getRange(row,3).setValue(messages[m].getSubject());       // Print the unique URL of the Gmail message      var id = "https://mail.google.com/mail/u/0/#all/"        + messages[m].getId();      sheet.getRange(row,4).setFormula(        '=hyperlink("' + id + '", "View")');        // Move to the next row      row++;    }   }  }}