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@ 2014-10-29T12:27:25Z

<?

echo preg_match('~^[0-9a-zA-ZäöüÄÖÜß\-\.]{3,20}$~', 'bobßä');

?>

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

44.74 ms | 402 KiB | 5 Q