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run code in 150+ php & hhvm versions
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<? $x = 'bob1'; echo preg_match('[0-9a-zA-Z]', $x); echo preg_match('~[0-9a-zA-Z]~', $x); echo preg_match('~[0-9a-zA-Z]+~', $x); ?>
based on BDGpV
Output for 5.4.34 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
011
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.4.32
<? $x = 'bob1'; echo preg_match('[0-9a-zA-Z]', $x); echo preg_match('~[0-9a-zA-Z]~', $x); echo preg_match('~[0-9a-zA-Z]+~', $x); ?>