* fixed #1484738

program/include/rcube_imap.inc

@@ -1771,7 +1771,10 @@ class rcube_imap
           $deleted = TRUE;
 
         foreach ($all_mboxes as $c_mbox)
-          if (preg_match('/^'.preg_quote($mailbox.$this->delimiter).'/', $c_mbox))
+          {
+          $regex = preg_quote($mailbox . $this->delimiter, '/');
+          $regex = '/^' . $regex . '/';
+          if (preg_match($regex, $c_mbox))
             {
             iil_C_UnSubscribe($this->conn, $c_mbox);
             $result = iil_C_DeleteFolder($this->conn, $c_mbox);
@@ -1779,6 +1782,7 @@ class rcube_imap
               $deleted = TRUE;
             }
           }
+        }
 
     // clear mailboxlist cache
     if ($deleted)

program/steps/settings/manage_folders.inc

@@ -119,8 +119,14 @@ else if ($_action=='delete-folder')
     {
     $OUTPUT->command('remove_folder_row', get_input_value('_mboxes', RCUBE_INPUT_POST));
     foreach ($a_mboxes as $mbox)
-      if (preg_match('/^'.preg_quote(get_input_value('_mboxes', RCUBE_INPUT_POST).$delimiter).'/', $mbox))
+      {
+      $regex = get_input_value('_mboxes', RCUBE_INPUT_POST) . $delimiter;
+      $regex = preg_quote($regex, '/');
+      if (preg_match('/^'. $regex .'/', $mbox))
+        {
         $OUTPUT->command('remove_folder_row', $mbox);
+        }
+      }
     $OUTPUT->show_message('folderdeleted', 'confirmation');
     $OUTPUT->send();
     }