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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match('/.[]]/', 'foo 42 [ b ]ar', $m), $m);
based on cT2OY
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(2) " ]" }