JavaScript/REGEX: Get CSS Class Attributes from HTML Comments

If any comment contains "xColor" and if there is a matching closing comment containing "/xColor" then I would like it to be wrapped in an <em> tag containing class attributes from the data inside the comments.

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Hello World</title>
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<style type="text/css">
.xColor.xRed{color:red}
.xColor.xYellow{color:yellow}
.xColor.xGreen{color:green}
</style>
<script type="text/javascript">
 $(function() {

  $('body').html( $('body').html().replace(/\<\!--xColor xRed--\>/g, '<em class="xColor xRed">').replace(/\<\!--\/xColor--\>/g,'</em>') );

 });
</script>
</head>

<body>

<!--xColor xRed-->
Red
<!--/xColor-->

<!-- xColor xYellow -->
Yellow
<!--/xColor-->

<!--xGreen xColor-->
Green
<!--/xColor green -->

<!-- xRed xColor    -->
Red
<!-- /xColor xRed-->

</body>
</html>

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skijAsked:
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chaauCommented:
If you want a universal regex use this:
$('body').html( $('body').html().replace(/\<\!--\s*xColor (xRed|xYellow|xGreen)\s*--\>/g, '<em class="xColor $1">').replace(/\<\!--\/xColor--\>/g,'</em>') );

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The trick is to use $1 to access the first group.
The \s* ignores the whitespace
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