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@ 2014-03-11T10:59:52Z

<?php
 if ( preg_match( '/^[A-Za-z0-9А-Яа-яЁ-ё\.\-\s]+$/', 'Сергей' ) ) {
    echo 'yaya';
}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

51.95 ms | 402 KiB | 5 Q