Split on every second comma in javascript

Question

For string:

\'29 July, 2014, 30 July, 2014, 31 July, 2014\'

How can I split on every second comma in the string? So that my results are:

Answer 1

I know it's almost two years ago.

This function is reusable.

String.prototype isn't necessary to make it work.. But it's easy..

String.prototype.splitEvery = function ( splitter, every ){

    var array = this.split( splitter), newString = '', thisSplitter; 

    $.each( array, function( index, elem ){ 

        thisSplitter = ( index < array.length - 1 || index % every === 0 ) ? '' : splitter;

        newString += elem + thisSplitter;                                                               
    });          

    return newString;                                                                                   
};  


var dateString = '29 July, 2014, 30 July, 2014, 31 July, 2014';

The usage in this case is:

dateString.splitEvery( ',', 2 );

First parameter is the split, second is how many is between each.

Result are:

29 July 2014, 30 July 2014, 31 July 2014