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run code in 150+ php & hhvm versions
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<?php preg_match_all('/X[a-z]{,1}/','XDSS-C-1XaXb XcXd for Xe', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(0) { } }