3v4l.org

run code in 150+ php & hhvm versions
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<?php $pattern = '/(:?(:?\/(?P<peekaboo>[^\/\.,;?\n]+))?\/(?P<action>[^\/\.,;?\n]+))?/'; if (preg_match($pattern, 'foo/bar', $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]=> string(0) "" }