Replicate lines containing specific words

Question

I want to edit a file using Notepad++, in such a way that I can copy(replicate) a line containing a specific word with some minor changes --

Example -- if the file has --

lASER_BALL
COMET_BALL
...

I want to change it to

LASER_BALL
LASER_BALL_END
COMET_BALL
COMET_BALL_END
...

Im talking about a file with a huge number of entries. Any idead on how this can be done using Notepad++ ?

Answer 1

Ctrl + H for search and replace:

        

Then, Select All Ctrl + A, then Ctrl + Shift + U.

Answer 2

This can be done with a regex find and replace

Answer 3

1. Replace (Ctrl-H)

2. Select "Regular expression" in "Search Mode"

3. Find what: (.*)
   Replace with: \1\r\n\1_END

4. Replace All (with In selection not ticked)