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run code in 150+ php & hhvm versions
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<?php $s = "ABC"; preg_match('/A\KBC/', $s, $m); var_dump($m);
Output for 4.4.9, 5.2.4 - 7.1.0
array(1) { [0]=> string(2) "BC" }
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.3
array(0) { }