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