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@ 2014-03-07T16:59:41Z

<?php
if (!preg_match('/[^a-z0-9]/i', '1oA023')){

    echo 'ok';
}else {

    echo 'wrong';
}

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

33.3 ms | 402 KiB | 5 Q