code: function(str, delim) {
        var res = []; 
        var segs = str.split(delim);
        var accum = '';
        for (let i = 0; i < segs.length; i++) {
          var seg = segs[i];
          if (seg.endsWith('\\')) {
            accum += seg.substring(0, seg.length - 1) + delim;
          }
          else {
            accum += seg;
            res.push(accum);
            accum = '';
          }
        }
        return res;
      }
docs: split a string based on a delimiter except when preceded by \