diff --git a/generate-firebase-json.js b/generate-firebase-json.js
index 16e0018..45a5254 100644
--- a/generate-firebase-json.js
+++ b/generate-firebase-json.js
@@ -39,8 +39,8 @@ const generateFirebaseJson = (
     compilation,
 ) => {
     const sourceGlob = htmlPluginData.outputName
-        .replace('/\.html/', '')
-        .replace('index', '@(/|index)')
+        .replace(/\.html/, '')
+        .replace(/index/, '@(/|index)')
       //  .replace(/404\.html/, '**/*')
        // .replace(/index\.html/, '\/?(index.html)?')
        // .replace(/\.html/, '(\\.html)?')