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run code in 150+ php & hhvm versions
Bugs & Features
<? echo preg_match('~^[0-9a-zA-Z]{3,20}$~', 'bob');
based on o8IIR
Output for 5.4.34 - 7.1.0
1
Output for 4.3.0 - 5.4.32
<? echo preg_match('~^[0-9a-zA-Z]{3,20}$~', 'bob');