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<? function checkValid($string) { preg_match('/[^A-Za-z0-9.#\\-$]/', $str) ? true : false; }
Output for 5.4.0 - 7.1.0
Output for 4.3.0 - 5.3.29
<? function checkValid($string) { preg_match('/[^A-Za-z0-9.#\\-$]/', $str) ? true : false; }