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<? echo preg_match('~^[0-9a-zA-Z]{3,20}$~', 'bohk'); ?>
based on IIl86
Output for 5.4.34 - 7.2.0
1
Output for 4.3.0 - 5.4.32
<? echo preg_match('~^[0-9a-zA-Z]{3,20}$~', 'bohk'); ?>