Splitting strings that contain commas (special characters?) - regex

Question

I'm working from a spreadsheet of values. I have code that pulls a row of content to analyze. I was planning to split it on commas, but some of the strings inside the cells include commas (that aren't regularly spaced, so escaping them would be difficult). I downloaded the sheet as a tsv instead of a csv and re-uploaded it, but my attempts to split on \t haven't been successful. (For good measure, I've also tried \n, \r, and \f to see if they're involved in delimiting cells. They don't seem to be.)
Is there a special character that means "next cell" or "next record" or something like that? Am I better off trying to end each cell with a particular character that I would then have to strip out of my data after splitting? I'd welcome any other ideas!
Code snippet:
var lastRowContents = dataSheet.getRange(lastRow, 1, 1, 21).getValues();
var contentChunks = lastRowContents.toString().split('\t');
var product = contentChunks[0];
Logger.log(product);
This outputs the entire row as one item in that array, like so:
product: Wed Jan 05 2005 02:00:00 GMT-0600 (CST),001-2005, Day-Lee Pride Beef Gyoza Potstickers, Vegetable and Beef Dumplings ,misbranded,http://www.fsis.usda.gov/wps/portal/fsis/topics/recalls-and-public-health-alerts/recall-case-archive/recall-case-archive-2005/!ut/p/a1/jZDBCoJAEIafpQdYdlZN9CgLppa7SGS2l1gW0wVTMfHQ06d0MpScOc3w_XzMYIEzLGo56EL2uqllNc3CvkMCNnEpRNz3fAiZ6acOOxDg9gjcZoBLJiBN-JFScJi5Mb9SHvzLRxsERhfTuMCilX2JdP1ocNblSlYVUvKVI9mpUg_54hIZAHt8xWKuATL2qDlbQcRM4NYvsPCHL7B-aPu8ZO9TADr0dh-fh2db/?1dmy&current=true&urile=wcm%3apath%3a%2Ffsis-archives-content%2Finternet%2Fmain%2Ftopics%2Frecalls-and-public-health-alerts%2Frecall-case-archive%2Farchives%2Fct_index271,http://www.fsis.usda.gov/wps/portal/fsis/topics/recalls-and-public-health-alerts/recall-case-archive/recall-case-archive-2005/!ut/p/a1/jZDBCoJAEIafpQdYdlZN9CgLppa7SGS2l1gW0wVTMfHQ06d0MpScOc3w_XzMYIEzLGo56EL2uqllNc3CvkMCNnEpRNz3fAiZ6acOOxDg9gjcZoBLJiBN-JFScJi5Mb9SHvzLRxsERhfTuMCilX2JdP1ocNblSlYVUvKVI9mpUg_54hIZAHt8xWKuATL2qDlbQcRM4NYvsPCHL7B-aPu8ZO9TADr0dh-fh2db/?1dmy&current=true&urile=wcm%3apath%3a%2Ffsis-archives-content%2Finternet%2Fmain%2Ftopics%2Frecalls-and-public-health-alerts%2Frecall-case-archive%2Farchives%2Fct_index386,Day-Lee Pride Beef Gyoza Potstickers, Vegetable and Beef Dumplings,Produced 10/6/2004. The products subject to recall are: One pound bags of "DAY-LEE PRIDE BEEF GYOZA POTSTICKERS, VEGETABLE AND BEEF DUMPLINGS." Each bag bears the code "28004," as well as "Est. 17309" inside the USDA mark of inspection.,The packages state that the gyozas are filled with beef, but they may instead contain shrimp, a known allergen.,The problem was discovered by the establishment.,17309 M Day-Lee Foods Inc. 13055 E. Molette St. Santa Fe Springs, CA 90670,,Approximately 2,520 pounds,California, Colorado, Georgia, Maryland, New York, and Washington.,Class I,U.S. Food and Drug Administration (FDA),,,,,

Answer 1

(just for visibility :)
since lastRowContents is an 2D array (link to doc) you have every cell with lastRowContents[0][0],lastRowContents[0][1],lastRowContents[0][2],etc..
in your code :
var lastRowContents = dataSheet.getRange(lastRow, 1, 1, 21).getValues();
var product = lastRowContents[0][0];
Logger.log(product);