Getting number of repetitions in regex in JavaScript

Question

This is kinda a follow-up question from this, in which a solution was provided for Notepad++ but unsuitable for JavaScript.

Let's say I have some random text:

let text = `aaaaaaaaaa
            5aaaa8aaaa
            4707aaaaaa
            a1aaaaaaaa
            923aaaaaaa`;

Now I want to replace each digit that appear after a newline with X, to achieve this end-result:

`aaaaaaaaaa
 Xaaaa8aaaa
 XXXXaaaaaa
 a1aaaaaaaa
 XXXaaaaaaa`

The solution provided for Notepad++ cannot be used here because the \G anchor is not available in JavaScript so text.replace(/(?:\G|^)\d/gm, 'X') does not work.

Are there any alternatives to using \G here, or any other ways to do this replacement in JavaScript?

@baao that only changes the first number on each line, i.e. it changes the 3rd line from 4707aaaaaa to X707aaaaaa instead of XXXXaaaaaa as intended — mozicid
– mozicid, Commented Aug 6, 2017 at 18:46

Ram · Accepted Answer · 2017-08-06 17:05:38Z

1

One option is:

text.replace(/\b(\d+)/g, m => 'X'.repeat(m.length))

answered Aug 6, 2017 at 17:05

Ram

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