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run code in 150+ php & hhvm versions
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<?php // alfanumeric check $value = '1567ababcdef'; if (preg_match('/[^a-f0-9]/', $value)) { echo 'Niet door alfanumeric check'; } else{ echo 'Door alfanumeric check'; }
Output for 4.3.0 - 7.1.0
Door alfanumeric check