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run code in 200+ php & hhvm versions
Bugs & Features
<?php $string = 'Lorem ipsum dolor sit amet.'; $alphanumeric = preg_match('~^[\pL\pN]++$~iu'); var_dump($alphanumeric);
Output for 4.3.3 - 7.2.0
Warning: preg_match() expects at least 2 parameters, 1 given in /in/7tqsM on line 5 bool(false)
Output for 4.3.0 - 4.3.2
Warning: Wrong parameter count for preg_match() in /in/7tqsM on line 5 NULL