Find and replace in Notepad ++ with regex

Question

I have a numerical list. One number per line. I want to replace all numbers with a specific pattern. For example, my file looks like this:

1
2
3
4

I want to replace it with one that looks like this: regexp in Notepad ++:

[1],
[2],
[3],
....

Answer 1

Find what:

([0-9]+)

Replaced by:

[\1],