Constructing the name of a pdf export from multi-line cell entries causing problems - google-apps

Question

I'm pretty new to scripting and have been learning by doing stuff (or more precisely finding generous people to do the stuff for me) so don't really know a lot. Apologies if the code is wrong, dumb or formatted incorrectly.
I have this code which should export a sheet in PDF format and name the export based on the strings in particular cells. This works well until you drop a multi-line cell entry into the mix. The code causing the trouble is below and the bit that is causing trouble is engine[0]:
function Generate_Form() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
ss.setActiveSheet(ss.getSheetByName('JobRequestForm'));
var tpjlr = ss.getRange("H8:I8").getValue();
if (tpjlr.length > 0) {
var email = "x#jaguarlandrover.com"
var email1 = ss.getRange("H5:I5").getValue() + ("#jaguarlandrover.com");
var email2 = ss.getRange("H6:I6").getValue() + ("#jaguarlandrover.com");
}
var subject = "Job request from " +ss.getRangeByName("D5:E5").getValue()+ "_" +ss.getRangeByName("D13:E13").getValue()+ "_" +ss.getRangeByName("D14:E14").getValue()+ "_TPJLR_" +ss.getRangeByName("H8:I8").getValue()+ "_" +ss.getRangeByName("D7:E7").getValue();
var body = "Objective of the request:- " + ss.getRange("D18:I18").getValue();
var url = "https://docs.google.com/spreadsheets/d/SS_ID/export?".replace("SS_ID", ss.getId());
var url_ext = 'exportFormat=pdf&format=pdf' // export as pdf / csv / xls / xlsx
+ '&size=letter' // paper size legal / letter / A4
+ '&portrait=true' // orientation, false for landscape
+ '&fitw=true&source=labnol' // fit to page width, false for actual size
+ '&sheetnames=false&printtitle=false' // hide optional headers and footers
+ '&pagenumbers=false&gridlines=false' // hide page numbers and gridlines
+ '&fzr=false' // do not repeat row headers (frozen rows) on each page
+ '&gid='+ss.getSheetId(); // the sheet's Id
var token = ScriptApp.getOAuthToken();
var engine = ss.getRange("D15:E15").getValue().split("\n");
var name = ss.getRange("D13:E13").getValue() + "_" + ss.getRange("D14:E14").getValue() + "_" + engine[0] + "_" + engine[1] + "_" + "TPJLR_" + ss.getRange("H8:I8").getValue() + "_" + ss.getRange("D7:E7").getValue() + ".pdf";
var response = UrlFetchApp.fetch(url + url_ext, {
headers: {
'Authorization': 'Bearer ' + token
}
}).getBlob().setName(name);
// var blob = response.getBlob().setName(name);
if (MailApp.getRemainingDailyQuota() > 0)
GmailApp.sendEmail(email, subject, body, {
htmlBody: body,
attachments:[response]
});

Answer 1

So I replaced
var engine = ss.getRange("D15:E15").getValue().split("\n");
var name = ss.getRange("D13:E13").getValue() + "_" + ss.getRange("D14:E14").getValue() + "_" + engine[0] + "_" + engine[1] + "_" + "TPJLR_" + ss.getRange("H8:I8").getValue() + "_" + ss.getRange("D7:E7").getValue() + ".pdf";
with
var input = ss.getRange("D15:E15").getValue();
var engine = input.replace(/(?:\r\n|\r|\n)/g, '_');
var name = ss.getRange("D13:E13").getValue() + "_" + ss.getRange("D14:E14").getValue()+ "_" + engine + "_" + "TPJLR_" + ss.getRange("H8:I8").getValue() + "_" + ss.getRange("D7:E7").getValue() + ".pdf";
Works now