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This #linux #regex #n00b is looking for help (string “find-and-replace”) after googling the issue to no avail.

in Notepad++ on Windows (and on Linux via Wine)

^.{3} then $0\r\n on 123456789 returns

123
456
789

I have not been able to replicate this in any of a number of Linux-native text editors such as NotepadQQ, Kate, Emacs, Vim, etc.

What am I doing wrong?