Hi, I'm trying to turn input from textarea into an array

here is what the textarea input look like

[input 1] [input 2] [input 3]

I'm trying to split everything inside the square bracket "[]" into an array.

here are my codes

PHP Code:
$option = array();
$regex "#[\[^]]*#s";
$input "[input 1] [input 2] [input 3]";

$option preg_split($regex$input, -1PREG_SPLIT_NO_EMPTY PREG_SPLIT_DELIM_CAPTURE ); 
the output is

PHP Code:
Array
(
    [
0] => input 1
    [
1] => input 2
    [
2] => input 3]

the closing bracket still there, So what am I missing the regex pattern? Thanks