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<? echo preg_match('~[0-9a-zA-Z]{3,20}~', '01234567890123456789'); ?>
based on eHEfp
Output for 5.4.34 - 7.1.0
1
Output for 4.3.0 - 5.4.32
<? echo preg_match('~[0-9a-zA-Z]{3,20}~', '01234567890123456789'); ?>