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run code in 150+ php & hhvm versions
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<?php $subject = "text text text text [helloo] text [hello2] (hello3) text"; $pattern = '/(?<=\[)(.+)(?=\])/is'; preg_match($pattern, $subject, $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => helloo] text [hello2 [1] => helloo] text [hello2 )
Output for hhvm-3.10.0

Process exited with code 153.