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@ 2014-06-13T12:35:03Z

<?php

if (preg_match('/[^a-z_\-0-9]/i', 'ñdani')) {

echo 'ok';
}
    else{
        echo 'not ok';}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

47.43 ms | 402 KiB | 5 Q