Regular expression for finding the special chars present in a given string

<?php
$str = "qdsdasdadsasd\";
$exp ="~@#$%^&*()_+=-[]'\|;  \"  :,./?";

if (preg_match("/[\~@#$%^&*()_+=-\[\]\'|;,.?\/\\\\\\\\]/", $str)) {
    echo "A match was found.";
} else {
    echo "A match was not found.";
}

?>