diff --git a/docs/usage/configuration-options.md b/docs/usage/configuration-options.md
index 87689dd6cac3178355d81bd4e75c1798fa4b4953..687ac7876ab14d61aa84a914690eec18710a462c 100644
--- a/docs/usage/configuration-options.md
+++ b/docs/usage/configuration-options.md
@@ -2231,8 +2231,8 @@ For example, the following package rule can be used to replace the registry for
   "packageRules": [
     {
       "matchDatasources": ["docker"],
-      "matchPackagePatterns": ["^docker.io/.*)"],
-      "replacementNameTemplate": "{{{replace 'docker.io/' 'ghcr.io/' packageName}}}"
+      "matchPackagePatterns": ["^docker\\.io/.+"],
+      "replacementNameTemplate": "{{{replace 'docker\\.io/' 'ghcr.io/' packageName}}}"
     }
   ]
 }
@@ -2246,13 +2246,13 @@ Or, to add a registry prefix to any `docker` images that do not contain an expli
     {
       "description": "official images",
       "matchDatasources": ["docker"],
-      "matchPackagePatterns": ["^[a-z-]+(:|$).*"],
+      "matchPackagePatterns": ["^[a-z-]+$"],
       "replacementNameTemplate": "some.registry.org/library/{{{packageName}}}"
     },
     {
       "description": "non-official images",
       "matchDatasources": ["docker"],
-      "matchPackagePatterns": ["^[a-z-]+\\/[a-z-]+(:|$).*"],
+      "matchPackagePatterns": ["^[a-z-]+/[a-z-]+$"],
       "replacementNameTemplate": "some.registry.org/{{{packageName}}}"
     }
   ]