php - strip text with regex -

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i want extract text between [ , ] regex in php:

example input: 

hello, [good] test [regex] test

desired output:

good regex

how can extract them?

use regex /\[(.*?)\]/

<?php $str='hello, [good] test [regex] test'; preg_match_all('/\[(.*?)\]/', $str, $matches); print_r($matches[1]);

output :

array (     [0] =>     [1] => regex )

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