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@ 2014-05-20T06:15:28Z

<?php

// alfanumeric check
$value = '1567ababcdefr';
if (preg_match('/[^a-f0-9]/', $value)) {
    echo 'Niet door alfanumeric check';
}
else{
    echo 'Door alfanumeric check';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

42.15 ms | 402 KiB | 5 Q