Index: branches/RC/kernel/units/images/image_event_handler.php
===================================================================
diff -u -N -r10098 -r10853
--- branches/RC/kernel/units/images/image_event_handler.php	(.../image_event_handler.php)	(revision 10098)
+++ branches/RC/kernel/units/images/image_event_handler.php	(.../image_event_handler.php)	(revision 10853)
@@ -153,7 +153,7 @@
 		$new_name = $filename.$ext;
 		while ( file_exists($path.'/'.$new_name) )
 		{
-	   		if ( preg_match("/({$filename}_)([0-9]*)($ext)/", $new_name, $regs) ) {
+	   		if ( preg_match('/('.preg_quote($filename, '/').'_)([0-9]*)('.preg_quote($ext, '/').')/', $new_name, $regs) ) {
 				$new_name = $regs[1].($regs[2]+1).$regs[3];
 			}
 			else {