diff --git a/telethon/extensions/markdown.py b/telethon/extensions/markdown.py
index 032f7eef..b69195ee 100644
--- a/telethon/extensions/markdown.py
+++ b/telethon/extensions/markdown.py
@@ -22,7 +22,7 @@ DEFAULT_DELIMITERS = {
     '```': MessageEntityPre
 }
 
-DEFAULT_URL_RE = re.compile(r'\[([\s\S]+?)\]\((.+?)\)')
+DEFAULT_URL_RE = re.compile(r'\[([\s\S]*?)\]\(([\s\S]*?)\)')
 DEFAULT_URL_FORMAT = '[{0}]({1})'