JavaScript split by string or regex

split.js

var str = "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa\n" +
          "bhds ahjds abdjsab dhjsab hdjs abhjds bahjsa";

var tests = 1000000;

console.time('split 1 without regex');
for(var i=0 ; i < tests ; i++) {
  var parts = str.split('\n');
}
console.timeEnd('split 1 without regex');

console.time('split 2 without regex');
for(var i=0 ; i < tests ; i++) {
  var parts = str.split('\n');
}
console.timeEnd('split 2 without regex');

console.time('split 1 with regex');
for(var i=0 ; i < tests ; i++) {
  var parts = str.split(/\n/);
}
console.timeEnd('split 1 with regex');

console.time('split 2 with regex');
for(var i=0 ; i < tests ; i++) {
  var parts = str.split(/\r\n|\r|\n/);
}
console.timeEnd('split 2 with regex');

console.time('split 3 with regex');
var re = /\r\n|\r|\n/;
for(var i=0 ; i < tests ; i++) {
  var parts = str.split(re);
}
console.timeEnd('split 3 with regex');