How do I search value (with regex) in array and push search value to multidimensional array in PHP?

From this array, I want parse value inside the brackets with regular expression,
I use this patte => [([^]]+)]

Array
(
    [0] => [DATA_1_A]
    [1] => [DATA_1_B] [DATA_2_B]
    [2] => [DATA_1_C] [DATA_2_C] [DATA_3_C]
)

And push value to multidimensional array.
Like this.

Array
(
    [0] => Array
        (
            [0] => DATA_1_A
        )
    [1] => Array
        (
            [0] => DATA_1_B
            [1] => DATA_2_B
        )
    [2] => Array
        (
            [0] => DATA_1_C
            [1] => DATA_2_C
            [2] => DATA_3_C
        )
)