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run code in 150+ php & hhvm versions
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<?php preg_match("/(?<=__).*?(?=__)/", 'Bize __ bu** __ lazımdır. __yok+-sa__ bu mu', $matches); print_r($matches);
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => bu** )
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Array ( )