Question

I’ve been looking for this for hours, right now I’ve ended in a very ugly way (but working). I would like to find a reusable nice way to do this.

I’ve a string like this:

wanna[0].some[0].javascript

I would like to replace the last digit occurence between square brackets:

wanna[0].some[1].javascript

I’ve ended this (ugly) way:

myString.replace(/\d].javascript$/, "1].javascript")

which should be the best regex to match that?

myString.replace(/\d/, 1) // this should be for the first digit
myString.replace(/\d/g, 1) // this for every digit

I’ve read about negative look-ahead but I still didn’t get if JS supports this.

Answer 1

Just use a negative lookahead to ascertain that there are no more brackets after the one you’re matching:

var text = 'wanna[0].some[0].javascript';

text = text.replace(/\[\d](?!.*\[)/, '[1]');

Here’s the fiddle: http://jsfiddle.net/bRkEP/