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run code in 150+ php & hhvm versions
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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'); } ?>
based on a5Rvr
Output for 5.4.0 - 7.1.0
--0-0
Output for 4.3.0 - 5.3.29
<? 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'); } ?>