Regex to exclude everything but what's inside [ ] including line breaks

Question

I want to clean a text that has some notes in [ ]. I just want to have this notes and nothing else. There's some notes with line breaks, but I want to include that also. So in:

    lorem ipsum [foo
    bar] lorem ipsum

I want to exclude the lorem ipsum, but keep the [foo bar]. Anyone can tell me how to do it?

Answer 1

Try this regex:

[([sS]*?)]

The captured group will have the text between the square brackets.