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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LVL 16
hankknightAsked:
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Gurvinder Pal SinghCommented:
you can check inside if the class name contains a space or not

 $('.xyz[class*="hello"]').each(function(index) {
  if ( $(this).getAttr("class").indexOf(" ") != -1 )
  {
      alert('The matching class is: ' + $(this).attr('class'));
  }
 });
0
leakim971PluritechnicianCommented:
Test page : http://jsfiddle.net/NPGCs/2/
<!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">
// You're welcome!
$(document).ready(function() {
 $('.xyz[class*="hello"]').each(function(index) {
  alert('The matching class is: ' + $(this).attr('class').match("\s*hello[^ ]*")[0] );
 });
});¿

</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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David S.Commented:
This should only show the classes that start with "hello":
$(document).ready(function() {
  var helloRE = /(^|\s)hello\S*/ig;
  $('.xyz[class*="hello"]').each(function(index) {
    var myClass=$(this).prop('class').match(helloRE);
    alert('The matching class is: ' + (myClass!=null?myClass.join(' '):''));
  });
});

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