SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<form>
    <textarea id="article_text"></textarea>
    <button type="submit">Test</button>
</form>

JavaScript

$.validator.addMethod(
    "regex",
    function(value, element, regexp) {
        var check = false;
        var re = new RegExp(regexp);
        return this.optional(element) || re.test(value);
    },
    "Please include your keyword(s)."
);
$("form").validate({ debug: true });
$("#article_text").rules("add", { regex: "test phrase" });