How to use regex to indent code in notepad++

Question

for example I have the following code

Module MPI
    Use MPI
    !
! MPI info
    If (true) Then
        Print *, \'\'
! empty line 1
! empty line 2
    End If
          


        

Answer 1

Since the engine is already passed on a comment line to indent it, I think it is impossible to use the same entire edited line for the next match to get the number of spaces. So I think you have to repeat the same replacement more times. Try with:

^(\s*)([^!\s].*?\r\n(\1\!.*?\r\n)*)\s*\!

always replacing it with $1$2$1!.

Like I said in the comment, if you have at most N consecutive comment lines, you will click on the "replace all" button N times