diff --git a/plugins/experimentation/src/preview.js b/plugins/experimentation/src/preview.js
index e253325a..628461e5 100644
--- a/plugins/experimentation/src/preview.js
+++ b/plugins/experimentation/src/preview.js
@@ -23,7 +23,7 @@ class AemExperimentationBar extends HTMLElement {
     // Create a shadow root
     const shadow = this.attachShadow({ mode: 'open' });
 
-    const cssPath = new URL(new Error().stack.split('\n')[2].match(/[a-z]+:[^:]+/)[0]).pathname.replace('preview.js', 'preview.css');
+    const cssPath = new URL(new Error().stack.split('\n')[2].match(/[a-z]+?:\/\/.*?\/[^:]+/)[0]).pathname.replace('preview.js', 'preview.css');
     const link = document.createElement('link');
     link.rel = 'stylesheet';
     link.href = cssPath;