Index: _source/plugins/styles/plugin.js
===================================================================
--- _source/plugins/styles/plugin.js	(revision 6357)
+++ _source/plugins/styles/plugin.js	(revision )
@@ -965,15 +965,14 @@
 	 */
 	function splitIntoPres( preBlock )
 	{
-		// Exclude the ones at header OR at tail,
-		// and ignore bookmark content between them.
-		var duoBrRegex = /(\S\s*)\n(?:\s|(<span[^>]+data-cke-bookmark.*?\/span>))*\n(?!$)/gi,
+		// Two consequent line-breaks make a split, be ware of bookmarks.
+		var duoBrRegex = /(?:(\n|<br[^>]*?>)((:?<span[^>]+data-cke-bookmark.*?\/span>)*))\1/gi,
 			blockName = preBlock.getName(),
 			splitedHtml = replace( preBlock.getOuterHtml(),
 				duoBrRegex,
-				function( match, charBefore, bookmark )
+				function( match, linebreak, bookmark )
 				{
-				  return charBefore + '</pre>' + bookmark + '<pre>';
+				  return bookmark + '</pre><pre>';
 				} );
 
 		var pres = [];