diff --git a/src/backend/html_markdown.py b/src/backend/html_markdown.py
index 93836bb1..ef077446 100644
--- a/src/backend/html_markdown.py
+++ b/src/backend/html_markdown.py
@@ -149,8 +149,8 @@ class HTMLProcessor:
link_regexes = [re.compile(r, re.IGNORECASE)
if isinstance(r, str) else r for r in [
# Normal :// URLs
- (r"(?P[a-zA-Z\d]+://(?P[a-z\d._-]+(?:\:\d+)?)"
- r"(?:/[/\-_.,a-z\d#%&?;=~]*)?(?:\([/\-_.,a-z\d#%&?;=~]*\))?)"),
+ (r"(?P[a-z\d]+://(?P[a-z\d._-]+(?:\:\d+)?)"
+ r"(?:/[/\-.,\w#%&?:;=~!$*+^@]*)?(?:\([/\-_.,a-z\d#%&?;=~]*\))?)"),
# mailto: and tel:
r"mailto:(?P[a-z0-9._-]+@(?P[a-z0-9.:-]*[a-z\d]))",