diff --git a/docs/superpowers/plans/2026-05-09-media-embed.md b/docs/superpowers/plans/2026-05-09-media-embed.md
index 923bf1a..1326b5d 100644
--- a/docs/superpowers/plans/2026-05-09-media-embed.md
+++ b/docs/superpowers/plans/2026-05-09-media-embed.md
@@ -522,10 +522,10 @@ In `MediaUrlResolver.php`, modify `detectYouTube()` and add helper methods:
     private function detectYouTube(string $url): ?string
     {
         $patterns = [
-            '#^https?://youtu\.be/([A-Za-z0-9_-]{11})(?:[/?#]|$)#',
-            '#^https?://(?:www\.|m\.)?youtube\.com/watch\?(?:[^#]*&)?v=([A-Za-z0-9_-]{11})(?:[&#]|$)#',
-            '#^https?://(?:www\.|m\.)?youtube\.com/shorts/([A-Za-z0-9_-]{11})(?:[/?#]|$)#',
-            '#^https?://(?:www\.|m\.)?youtube\.com/embed/([A-Za-z0-9_-]{11})(?:[/?#]|$)#',
+            '~^https?://youtu\.be/([A-Za-z0-9_-]{11})(?:[/?#]|$)~',
+            '~^https?://(?:www\.|m\.)?youtube\.com/watch\?(?:[^#]*&)?v=([A-Za-z0-9_-]{11})(?:[&#]|$)~',
+            '~^https?://(?:www\.|m\.)?youtube\.com/shorts/([A-Za-z0-9_-]{11})(?:[/?#]|$)~',
+            '~^https?://(?:www\.|m\.)?youtube\.com/embed/([A-Za-z0-9_-]{11})(?:[/?#]|$)~',
         ];
         $videoId = null;
         foreach ($patterns as $p) {