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<?php $var=4; if (preg_match('/^[0-4]*$/', $var)) { echo $var . " is ok"; } else { echo $var . " is NOT ok";}
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
4 is ok