jquery / JavaScript replace xth occurrence

Question

I have a string like this:

var str = "A A A A A";

how do I replace a specific A with something else?

Eg: replace 3rd A to:

var str = "A A 00 A A";

Of the 1st, 2nd, etc.. ?

google 'javascript replace nth occurrence', there are so many variants on stackoverflow alone that i don't even know which one to say this is a duplicate of. — hubson bropa, Jun 29 '15 at 17:04
possible duplicate of [Replacing the nth instance of a regex match in Javascript](http://stackoverflow.com/questions/36183/replacing-the-nth-instance-of-a-regex-match-in-javascript) — hubson bropa, Jun 29 '15 at 17:05

score 1 · Answer 1 · answered Jun 29 '15 at 15:48

1

I would split the str, replace whatever index, then join back

var str = "A    A    A    A    A";
var sp=str.split('   ');
var ind=2;
sp[ind]='00';
console.log(sp.join('   '));

answered Jun 29 '15 at 15:48

depperm

score 0 · Answer 2 · answered Jun 29 '15 at 19:58

0

I prefer to use regular expression, here is the answer:

newValue = str.replace(/(([^A]*A){2}[^A]*)A/g, '$100');

Notes: {2} is the number of the occurrence we want to replace.

$100 here we specify which is the new string we want to place after the $1

answered Jun 29 '15 at 19:58

Chris Rosete

2 Answers2