diff --git a/src/applications/differential/config/PhabricatorDifferentialConfigOptions.php b/src/applications/differential/config/PhabricatorDifferentialConfigOptions.php
--- a/src/applications/differential/config/PhabricatorDifferentialConfigOptions.php
+++ b/src/applications/differential/config/PhabricatorDifferentialConfigOptions.php
@@ -133,7 +133,7 @@
             'to affect existing revisions. For instructions, see '.
             '**[[ %s | Managing Caches ]]** in the documentation.',
             $caches_href))
-        ->addExample("/config\.h$/\n#/autobuilt/#", pht('Valid Setting')),
+        ->addExample("/config\.h$/\n#(^|/)autobuilt/#", pht('Valid Setting')),
       $this->newOption('differential.sticky-accept', 'bool', true)
         ->setBoolOptions(
           array(