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@ 2014-10-29T11:21:16Z

<?

echo preg_match('~[0-9a-zA-Z]{3,20}~', '012345678901234567890fhgjkhfg');

?>

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

34.34 ms | 402 KiB | 5 Q