utils.py: escape_markdown handles urls and all reserved characters

CHANGELOG.rst

@@ -9,6 +9,10 @@ and this project adheres to `Semantic Versioning <https://semver.org/spec/v2.0.0
 -------------
 `Unreleased`_
 -------------
+Fixed
+-----
+- Correctly escape all reserved markdown characters and markdown links
+
 ---------------------
 `0.2.0`_ - 2020-06-16
 ---------------------

telegram_stats_bot/utils.py

@@ -21,6 +21,13 @@
 
 import re
 
+md_match = re.compile(r"(\[[^][]*]\(http[^()]*\))|([_*[\]()~>#+-=|{}.!\\])")
+
 
 def escape_markdown(string: str) -> str:
-    return re.sub(r'([\\_*\[\]()`])', r'\\\g<1>', string)
+    def url_match(match: re.Match):
+        if match.group(1):
+            return f'{match.group(1)}'
+        return f'\\{match.group(2)}'
+
+    return re.sub(md_match, url_match, string)