3v4l.org

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<?php $re = '/a\[(\w+)\]/i'; $str = 'a[link1], a[link2] a[link3] text text text a[link4] text a[link5] text'; preg_match_all($re, $str, $links); var_dump($links[1]);
Output for 7.3.0, 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.7
array(5) { [0]=> string(5) "link1" [1]=> string(5) "link2" [2]=> string(5) "link3" [3]=> string(5) "link4" [4]=> string(5) "link5" }
preferences:
112.98 ms | 1279 KiB | 4 Q