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@ 2013-06-24T23:21:02Z

<?php
$vals = array(
    "[[aa]]",
    "/\\/\\",
    "&",
    "$^",
);
foreach ($vals as $v) {
    var_dump(
        preg_match(
            '/^[-+=_.:;!?@#\\$%\\^&*a-z0-9\\\\\\/\\(\\)\\[\\]\\{\\}\'"]$/i',
            $v
        )
    );
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

49.78 ms | 402 KiB | 5 Q