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run code in 150+ php & hhvm versions
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<?php $regex = '/^(\/(\d+))+$/'; $str = '/1/20/3'; preg_match_all( $regex, $str, $result ); var_dump( $result );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(1) { [0]=> string(7) "/1/20/3" } [1]=> array(1) { [0]=> string(2) "/3" } [2]=> array(1) { [0]=> string(1) "3" } }
Output for hhvm-3.10.0

Process exited with code 153.