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<? echo preg_match('~[0-9a-zA-Z]{3,20}~', '012345678901234567890fhgjkhfg'); ?>
based on b4fHD
Output for 5.4.0 - 7.1.0
1
Output for 4.3.0 - 5.3.29
<? echo preg_match('~[0-9a-zA-Z]{3,20}~', '012345678901234567890fhgjkhfg'); ?>