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run code in 150+ php & hhvm versions
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<?php preg_match('~container(?:.)([a-z]+)~', "container.hello", $m); var_dump($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(15) "container.hello" [1]=> string(5) "hello" }