[SOLVED] Extract strings between brackets for each line

Issue

Suppose I have a text like this:

a b [c] d [e]
f [g]
[h]
i j
k [l]

I'd like to ask how to extract the strings between brackets line by line using sed or awk command?

The output should be:

c e
g
h

l

Edit: the following script seems to work.

while read -r line; do
  echo "$line" | awk 'NR > 1 {printf "%s ", $1;}' RS='[' FS=']';
  echo ; 
done < file.txt;

Solution

This might work for you (GNU sed):

sed -r 's/[^[]*(\[([^]]*)\])*( *)[^[]*/\2\3/g' file

Answered By - potong

Answer Checked By - Dawn Plyler (WPSolving Volunteer)