ruanweihong-aaa commented on code in PR #13800:
URL: https://github.com/apache/apisix/pull/13800#discussion_r3755235823


##########
apisix/plugins/proxy-rewrite.lua:
##########
@@ -225,6 +247,14 @@ function _M.check_schema(conf)
             if not secret.is_secret_ref(pattern) then
                 local test_replacement = secret.is_secret_ref(replacement)
                                          and "" or replacement
+                if test_replacement ~= "" then
+                    local err
+                    test_replacement, err = escape_nginx_vars(test_replacement)
+                    if err then
+                        return false, "invalid regex_uri replacement(" ..
+                            replacement .. "): " .. err
+                    end
+                end

Review Comment:
   Added an inline comment in `d1b362b` explaining that schema validation must 
keep validating PCRE captures without treating NGINX variables as named 
captures.



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