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@ 2014-01-06T19:06:08Z

<?php
$string = 'e23e23';
function checkValid($string) {
        preg_match('/[^A-Za-z0-9.#\\-$]/', $str) ? true : false;
    }

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

43.62 ms | 402 KiB | 5 Q