SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by Kishore Polsani

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>
    <input type="text"  name="test" />
    <button type="submit">Test</button>
</form>

JavaScript

jQuery.validator.addMethod("equals", function(value, element, param) { 
  return this.optional(element) || value === param; 
}, jQuery.format("You must enter {0}"));

$("form").validate({
    rules: { 
        test: { 
            required: true, 
            equals: "string to check" 
        } 
    },
    debug: true
});