Cutting a string at nth occurrence of a character

Question

What I want to do is take a string such as this.those.that and get a substring to or from the nth occurrence of a character. So, from the start of the string to

Answer 1

Just in case somebody needs both "this" and "those.that" in a way as alex described in his comment, here is a modified code:

var str = 'this.those.that',
    delimiter = '.',
    start = 1,
    tokens = str.split(delimiter),
      result = [tokens.slice(0, start), tokens.slice(start)].map(function(item) {
    return item.join(delimiter);
  }); // [ 'this', 'those.that' ] 

document.body.innerHTML = result;