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@ 2013-06-24T23:25:44Z

<?php

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

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

38.06 ms | 402 KiB | 5 Q