Improve image path regex to handle spaces, parentheses, and emojis in standard markdown image links with greedy matching and path trimming

backend/image_processor.py

@@ -165,12 +165,13 @@ def _process_standard_images(
     
     Resolves the path and updates to use /api/image endpoint.
     """
-    # Pattern: ![alt](path)
-    pattern = r'!\[([^\]]*)\]\(([^)]+?\.(?:png|jpg|jpeg|gif|svg|webp|bmp|ico))\)'
+    # Pattern: ![alt](path) - match everything including spaces, parentheses, and emojis
+    # Captures from ]( to ) where the content ends with an image extension
+    pattern = r'!\[([^\]]*)\]\((.+\.(?:png|jpg|jpeg|gif|svg|webp|bmp|ico))\)'
     
     def replace_standard_img(match):
         alt_text = match.group(1)
-        image_path = match.group(2)
+        image_path = match.group(2).strip()
         
         # Skip if it's already an absolute URL (http://, https://, //)
         if re.match(r'^(https?://|//)', image_path):