Google Apps Script Gmail CSV Import to Sheet Error

Question

I've pieced together this code from various google searches that will pull an e-mail's CSV attachment if the e-mail has a specific label.

function importCSVFromGmail() { 
  //gets first(latest) message with set label
  var threads = GmailApp.getUserLabelByName('Dashboard Updates').getThreads(0,1);     
  var message = threads[0].getMessages()[0];
  var attachment = message.getAttachments()[0];

  // Is the attachment a CSV file
  if (attachment.getContentType() === "text/csv") {                            
    var ss = SpreadsheetApp.getActive();
    var sh = ss.getSheetByName("Monthly_Detail_Instantis");
    //parses content of csv to array
    var dataString = attachment.getDataAsString();
    var escapedString = dataString.replace(/(?=["'])(?:"[^"\\]*(?:\\[\s\S][^"\\]*)*"|'[^'\\]\r\n(?:\\[\s\S][^'\\]\r\n)*')/g, '\\r\\n');
    var csvData = Utilities.parseCsv(escapedString);

    // Remember to clear the content of the sheet before importing new data
    sh.clearContents().clearFormats();                                         
    //pastes array to sheet
    sh.getRange(1, 1, csvData.length, csvData[0].length).setValues(csvData);   
  }

  //marks the Gmail message as read and unstars it (Filter sets a star)
  message.markRead();                                                          
  message.unstar();                                                            

}

The script runs fine, however I am running into issues with cells that had values with commas or quotes. For example, if a cell has the following:

1,000,000

or

Google "Apps" Script

It will return to following, respectively.

\r\n

\r\n\r\n\r\n

I'm certain it has to do with the Regex used, however I am not certain how to adjust for the above. Any help with this would be greatly appreciated.

Answer 1

I was able to use the original code (used in question) and replace the escaping and Utilities.parseCsv with code from this link. This will properly import CSVs even if cells include quotes and commas: https://productforums.google.com/forum/#!topic/docs/nhXjrl8JIek

Here is my final code:

function importCSVFromGmail() { 
  //gets first(latest) message with set label
  var threads = GmailApp.getUserLabelByName('Dashboard Updates').getThreads(0,1);     
  var message = threads[0].getMessages()[0];
  var attachment = message.getAttachments()[0];

  // Is the attachment a CSV file
  if (attachment.getContentType() === "text/csv") {                            
    var ss = SpreadsheetApp.getActive();
    var sh = ss.getSheetByName("Monthly_Detail_Instantis");
    //parses content of csv to array
    var dataString = attachment.getDataAsString();
    var csvData = CSVToArray(dataString);

    // Remember to clear the content of the sheet before importing new data
    sh.clearContents().clearFormats();                                         
    //pastes array to sheet
    var lastRowValue = sh.getLastRow();
    for (var i = 0; i < csvData.length; i++) {
       sh.getRange(i+lastRowValue+1, 1, 1, csvData[i].length).setValues(new Array(csvData[i]));
    } 
  }

  //marks the Gmail message as read and unstars it (Filter sets a star)
  message.markRead();                                                          
  message.unstar();                                                            

}

//The code formats the code so it can be entered into the Google Script

function CSVToArray( strData, strDelimiter ){ 
  // Check to see if the delimiter is defined. If not,
  // then default to comma.
  strDelimiter = (strDelimiter || ",");

  // Create a regular expression to parse the CSV values.
  var objPattern = new RegExp(
    (
      // Delimiters.
      "(\\" + strDelimiter + "|\\r?\\n|\\r|^)" +


      // Quoted fields.
      "(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|" +


      // Standard fields.
      "([^\"\\" + strDelimiter + "\\r\\n]*))"
    ),
    "gi"
  );


  // Create an array to hold our data. Give the array
  // a default empty first row.
  var arrData = [[]];

  // Create an array to hold our individual pattern
  // matching groups.
  var arrMatches = null;

  // Keep looping over the regular expression matches
  // until we can no longer find a match.
  while (arrMatches = objPattern.exec( strData )){

    // Get the delimiter that was found.
    var strMatchedDelimiter = arrMatches[ 1 ];

    // Check to see if the given delimiter has a length
    // (is not the start of string) and if it matches
    // field delimiter. If id does not, then we know
    // that this delimiter is a row delimiter.
    if (
      strMatchedDelimiter.length &&
      (strMatchedDelimiter != strDelimiter)
    ){

      // Since we have reached a new row of data,
      // add an empty row to our data array.
      arrData.push( [] );

    }

    // Now that we have our delimiter out of the way,
    // let's check to see which kind of value we
    // captured (quoted or unquoted).
    if (arrMatches[ 2 ]){

      // We found a quoted value. When we capture
      // this value, unescape any double quotes.
      var strMatchedValue = arrMatches[ 2 ].replace(
        new RegExp( "\"\"", "g" ),
        "\""
      );

    } else {

      // We found a non-quoted value.
      var strMatchedValue = arrMatches[ 3 ];

    }

    // Now that we have our value string, let's add
    // it to the data array.
    arrData[ arrData.length - 1 ].push( strMatchedValue );
  }

  // Return the parsed data.
  return( arrData );
}