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run code in 150+ php & hhvm versions
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<?php preg_match('/([A-Za-z]+)::([A-Za-z]+)/', 'Foo::Bar', $m); var_dump($m);
based on nMS6f
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(8) "Foo::Bar" [1]=> string(3) "Foo" [2]=> string(3) "Bar" }