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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); echo $x; ?>
based on Yn8SA
Output for 5.4.34 - 7.1.0
011bob1
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); echo $x; ?>