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run code in 150+ php & hhvm versions
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<?php if (preg_match('%^(\w+)(/(\w+))?$%', 'hom/bal', $matches)) { print_r($matches); }
Output for 4.3.0 - 7.1.0
Array ( [0] => hom/bal [1] => hom [2] => /bal [3] => bal )