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<?php $array =array( "123,456,789"=> "1,1,1", "333"=>"1", "777"=>"1" ); $keys = array_keys($array); $matching_key = preg_grep("/\b456\b/", $keys); var_dump($matching_key);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(11) "123,456,789" }

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