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jQuery: Find the matching class name

Hello,

How can I find the class name that matches? In the example below, I get additional class names. I only want the alert to contain class names that have "hello" in them.

Instead of:
adsfd helloABC xyz adfdsfdasfadsf

The alert should be:
helloABC

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript">
// Thanks, leakim971
$(document).ready(function() {
 $('.xyz[class*="hello"]').each(function(index) {
  alert('The matching class is: ' + $(this).attr('class'));
 });
});

</script>
</head>
<body>

<h1 class="adsfd helloABC xyz adfdsfdasfadsf">Heading</h1>
<div class="hello1">1</div>
<div class="adsfdsf hello123 dasfads fdsa sd adsf xyz">2</div>
<div class="hello3">3</div>
<p class="nomatch  xyz">This should not be included</p>
<p class="helloP">ABC</p>
<p class="helloTest cvsdfadfasf xyz">XYZ</p>

</body>
</html>

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SOLUTION