[Minor] rbl: revisit previous change

diff --git a/lualib/plugins/rbl.lua b/lualib/plugins/rbl.lua
index 812407f4dad1af37745e250df1fa4ecbb84ab949..b5232a8b463f138338b89c0b92266b6192986706 100644 (file)
--- a/lualib/plugins/rbl.lua
+++ b/lualib/plugins/rbl.lua
@@ -203,7 +203,7 @@ local function convert_checks(rule)
   if rule.returncodes and not rule.returncodes_matcher then
     for _, v in pairs(rule.returncodes) do
       for _, e in ipairs(v) do
-        if e:find('%', 1, true) or e:find('[%.%d%x:]%[', 1, false) then
+        if e:find('[%%%[]') then
           rspamd_logger.warn(rspamd_config, 'implicitly enabling luapattern returncodes_matcher for rule %s', rule.symbol)
           rule.returncodes_matcher = 'luapattern'
           break