JSFiddle - React, Tailwind, and code Playground

JavaScript

String.prototype.splitCSV = function() {
        var matches = this.match(/(\s*"[^"]+"\s*|\s*[^,]+|,)(?=,|$)/g);
        for (var n = 0; n < matches.length; ++n) {
            matches[n] = matches[n].trim();
            if (matches[n] == ',') matches[n] = '';
        }
        if (this[0] == ',') matches.unshift("");
        return matches;
}

var string = ',"string, duppi, du" , 23 ,,, "string, duppi, du",dup,"", , lala';
var parsed = string.splitCSV();
alert(parsed.join('|'));