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@ 2014-10-29T12:02:04Z

<?

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

?>

Output
Performance
VLD
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preg_match: documentation ( source)

preferences:dark modelive preview

41.69 ms | 402 KiB | 5 Q