How to insert a piece of text into several files of the same type in notepad ++ at the same time?

Question

Notepad++

Hello!
There are files of the same type (about 150 pieces). Is it possible to insert a piece of text at the right place at the same time in these files using Notepad++? Files of this type:
1st file
123
4567
890
2nd file
123
3567
234
3rd file
124
3789
234
How can I insert for example 89012 between the 2nd and 3rd line of all files at the same time? Is it possible?

Answer 1

https://superuser.com/questions/1003790/how-to-fin...
+ Use regular expression to insert text after second \n (this will be between 2nd and 3rd line)