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run code in 150+ php & hhvm versions
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<? echo preg_match('~[0-9a-zA-Z]{3}~', 'bobob'); ?>
based on 656PP
Output for 5.4.34 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.4.32
<? echo preg_match('~[0-9a-zA-Z]{3}~', 'bobob'); ?>