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<? echo "-"; if(preg_match('[0-9a-zA-Z]', 'bob')) { echo preg_match('[0-9a-zA-Z]', 'bob'); } echo "-"; if(preg_match('~[0-9a-zA-Z]~', 'bob')) { echo preg_match('[0-9a-zA-Z]', 'bob'); } echo "-"; if(preg_match('~[0-9a-zA-Z]+~', 'bob')) { echo preg_match('[0-9a-zA-Z]', 'bob'); } echo "-"; ?>
based on cnNEH
Output for 5.4.34 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
--0-0-
Output for hhvm-3.10.0

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