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run code in 150+ php & hhvm versions
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<?php $text = '*/10 * * * *'; if(preg_match('/[^0-9\*\/]/', $text )) echo 'preg_match GOOD! <br/>'; else echo "preg_match BAD!<br/>";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
preg_match GOOD! <br/>