Increment last number in string

Question

given the following string:

Backticks[0].Folders[0]

I need to increment the latter number.

I'm not an expert with Regexp replacements, I tried this but it also selects the bracket.

href = href.replace(/\d+]$/gi, matchedNumber++);

Is it possible to do the selection, incremental and replacement in a one liner?

Answer 1

It is possible to do in one line

'Ace[0].Folders[0]'.replace(/\d+(?=]$)/, function(i) { return parseInt(i) + 1; })

Answer 2

Use a positive lookahead:

/\d(?=]$)/gi

This will make sure there is any character after then the end of string after the digit, without including it in the replace.

If you would like to increment it, you could use match and parseInt:

var href = this.href;
var re = /\d(?=.$)/gi
href = href.replace(re, parseInt(href.match(re))+1);

Here is a page where you can learn more about this.

Here is a fiddle.