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:

[0] => 29 July, 2014
[1] => 30 July, 2014
[2] => 31 July, 2014

Answer 1

Or this:

var text='29 July, 2014, 30 July, 2014, 31 July, 2014';
result=text.match(/([0-9]+ [A-z]+, [0-9]+)/g);

UPD: You can use this regExp to a find all matches:

//    result=text.match(/[^,]+,[^,]+/g);

    var text='string1, string2, string3, string4, string5, string 6';
    result=text.match(/[^,]+,[^,]+/g);

/*
result: 
string1, string2
string3, string4
string5, string 6
*/

Answer 2

You can split with a regular expression. For example:

var s = '29 July, 2014, 30 July, 2014, 31 July, 2014';
s.split(/,(?= \d{2} )/)

returns

["29 July, 2014", " 30 July, 2014", " 31 July, 2014"]

This works OK if all your dates have 2 digits for the day part; ie 1st July will be printed as 01 July.

The reg exp is using a lookahead, so it is saying "split on a comma, if the next four characters are [space][digit][digit][space]".

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Edit - I've just improved this by allowing for one or two digits, so this next version will deal with 1 July 2014 as well as 01 July 2014:

s.split(/,(?= \d{1,2} )/)

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Edit - I noticed neither my nor SlyBeaver's efforts deal with whitespace; the 2nd and 3rd dates both have leading whitespace. Here's a split solution that trims whitespace:

s.split(/, (?=\d{1,2} )/)

by shifting the problematic space into the delimiter, which is discarded.

["29 July, 2014", "30 July, 2014", "31 July, 2014"]