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run code in 150+ php & hhvm versions
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<?php $str = 'key1="value" key2="2nd value" key3="3rd value"'; preg_match_all('/(\w+)="([^"]*)"/', $str, $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => key1="value" [1] => key2="2nd value" [2] => key3="3rd value" ) [1] => Array ( [0] => key1 [1] => key2 [2] => key3 ) [2] => Array ( [0] => value [1] => 2nd value [2] => 3rd value ) )