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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 5.2.11 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(2) { [0]=> string(0) "" [1]=> string(1) "a" }