Jquery :: Validation Rules AddMethod - PHP Filter For Form

I have created a php filter for a form that returns an error message if someone uses profanity in the comments field and makes them redo that field before inserting into a database. Here is the code I use for that (I have omitted the lengthy list of profanity..):

Code:
if (isset($_POST['comments'])){
$comments = $_POST['comments'];
$filter=array("badword1", "badword2");
for ($i = 0; $i < count($filter); $i++) { .....
if (preg_match("/".$filter[$i]."/i", $comments)) {
$profanity_msg="Profanity is not allowed";
}}}
//Then this before the form
if(isset($profanity_msg)){
echo $profanity_msg;
}

However, the rest of my form is validated through JQuery Validator and I would like to make a rule that would do the filtering instead of relying on the php. Here is a sketch of what I think I will need to do to build the custom rule, but I am not sure how to write the equivalent function to my php code above.

Code:
$(document).ready(function(){
//custom validation rule - profanity
$.validator.addMethod("profanity",
"Equivalent of my php function goes here..."
);
//validation implementation will go here.
$("#TestForm").validate({
rules: {
comments: {
required: true,
profanity: true
}},
messages: {
comments: {
required: "* Required",
profanity: "* No Profanity Allowed"
}}});
})