Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5403)
+++ /CKEditor/trunk/CHANGES.html	(revision 5404)
@@ -156,5 +156,6 @@
 		<li><a href="http://dev.fckeditor.net/ticket/5425">#5425</a> : [Opera] Disable SCAYT plugin for Opera browser.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/5450">#5450</a> : [FireFox] Press enter on 'replace' button result wrong.</li>
-		<li><a href="http://dev.fckeditor.net/ticket/5121">#5121</a> : recognizes the <br /> tag as a separator when apply block styles in enter_br mode.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/5121">#5121</a> : Recognizes the &lt;br /&gt; tag as a separator when apply block styles in enterMode=BR.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/5575">#5575</a> : CKEDITOR.replaceAll should consider all kind of white spaces between class names.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.fckeditor.net/ticket/5326">#5326</a> : Catalan;</li>
Index: /CKEditor/trunk/_source/core/ckeditor_basic.js
===================================================================
--- /CKEditor/trunk/_source/core/ckeditor_basic.js	(revision 5403)
+++ /CKEditor/trunk/_source/core/ckeditor_basic.js	(revision 5404)
@@ -189,5 +189,5 @@
 					// parameter.
 
-					var classRegex = new RegExp( '(?:^| )' + arguments[0] + '(?:$| )' );
+					var classRegex = new RegExp( '(?:^|\\s)' + arguments[0] + '(?:$|\\s)' );
 
 					if ( !classRegex.test( textarea.className ) )