Handle lua patterns.

% requires escaping.

userspace/engine/lua/rule_loader.lua

@@ -261,14 +261,19 @@ function load_rules(rules_content, rules_mgr, verbose, all_events, extra, replac
 	    -- If the format string contains %container.info, replace it
 	    -- with extra. Otherwise, add extra onto the end of the format
 	    -- string.
-	    if string.find(v['output'], "%container.info") ~= nil then
+	    if string.find(v['output'], "%container.info", nil, true) ~= nil then
+
 		-- There may not be any extra, or we're not supposed
 		-- to replace it, in which case we use the generic
 		-- "%container.name (id=%container.id)"
-	       if extra == "" or replace_container_info == false then
-		  v['output'] = string.gsub(v['output'], "%container.info", "%container.name (id=%container.id)")
+	       if replace_container_info == false then
+		  v['output'] = string.gsub(v['output'], "%%container.info", "%%container.name (id=%%container.id)")
+		  if extra ~= "" then
+		     v['output'] = v['output'].." "..extra
+		  end
 	       else
-		  v['output'] = string.gsub(v['output'], "%container.info", extra)
+		  safe_extra = string.gsub(extra, "%%", "%%%%")
+		  v['output'] = string.gsub(v['output'], "%%container.info", safe_extra)
 	       end
 	    else
 	       -- Just add the extra to the end