Regex to change the number of spaces in an indent level

Question

Let\'s say you have some lines that look like this

1  int some_function() {
2    int x = 3;  // Some silly comment

And so on. The indentation i

Answer 1

Here's another one, instead utilizing \G which has NET, PCRE (C, PHP, R…), Java, Perl and Ruby support:

s/(^|\G) {2}/   /g

\G [...] can match at one of two positions:
✽ The beginning of the string,
✽ The position that immediately follows the end of the previous match.

^{Source: http://www.rexegg.com/regex-anchors.html#G}

We utilize its ability to match at the position that immediately follows the end of the previous match, which in this case will be at the start of a line, followed by 2 whitespaces (OR a previous match following the aforementioned rule).

See example: https://regex101.com/r/qY6dS0/1