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run code in 150+ php & hhvm versions
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<?php $vals = array( "[[aa]]", "/\\/\\", "&", "$^", ); $rx = '/^[-+=_.:;!?@#$%&*<>^"\'\\\\\\/\\(\\)\\[\\]\\{\\}a-z0-9]+$/i'; foreach ($vals as $v) { var_dump(preg_match($rx, $v)); }
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(1) int(1) int(1)