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run code in 150+ php & hhvm versions
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<?php $str = "*yi*"; preg_match('/^(\*?)([^\*]+)\*+/', $str, $m); var_dump($m);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(4) "*yi*" [1]=> string(1) "*" [2]=> string(2) "yi" }