Remove all occurrences except last?

Question

I want to remove all occurrences of substring = . in a string except the last one.

E.G:

1.2.3.4

should become:

Answer 1

You can do something like this:

var str = '1.2.3.4';
var last = str.lastIndexOf('.');
var butLast = str.substring(0, last).replace(/\./g, '');
var res = butLast + str.substring(last);

Live example:

• http://jsfiddle.net/qwjaW/