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run code in 150+ php & hhvm versions
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<?php $vals = array( "[[aa]]", "/\\/\\", "&", "$^", "(){}'\"", ); foreach ($vals as $v) { var_dump( preg_match( '/^[-+=_.:;!?@#$%^&*a-z0-9\\\\\\/\\(\\)\\[\\]\\{\\}\'"]+$/i', $v ) ); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(1) int(1) int(1) int(1)