Index: branches/unlabeled/unlabeled-1.3.2/core/units/images/image_event_handler.php
===================================================================
diff -u -N -r7648 -r10855
--- branches/unlabeled/unlabeled-1.3.2/core/units/images/image_event_handler.php	(.../image_event_handler.php)	(revision 7648)
+++ branches/unlabeled/unlabeled-1.3.2/core/units/images/image_event_handler.php	(.../image_event_handler.php)	(revision 10855)
@@ -137,7 +137,7 @@
 		$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 {