SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<form id="signupForm" method="get" action="">
    <p>Test here, no caps rule: <input name="test" type="text"></p>
    <input type="submit" value="Test" />
</form>

JavaScript

$.validator.addMethod("noCaps", function(value, element) {
  return this.optional(element) || !/[A-Z]{4}/.test(value); 
}, "You are not permitted to input more than three uppercase letters in a row!");

$(function() {
  $("form").validate({
    rules: {
        test: {
            noCaps: true
        }
    },
    debug: true,
    submitHandler: function() {
        alert("Passed!");
    }
  });
});