feat(quote): improve markdown escaping

fcts/quote.py

@@ -10,6 +10,7 @@
 from libs.arguments import args
 from libs.bot_classes import Axobot
 from libs.quote.generator import QuoteGeneration, QuoteStyle
+from libs.text_cleanup import remove_markdown
 
 
 class Quote(commands.Cog):
@@ -70,7 +71,7 @@ async def quote_message(
             self, message: discord.Message, channel: discord.abc.Messageable, style: QuoteStyle
             ) -> Optional[discord.Message]:
         "Generate a Quote card from a message and post it to the channel"
-        text = discord.utils.remove_markdown(message.clean_content)
+        text = remove_markdown(message.clean_content)
         while '\n\n' in text:
             text = text.replace('\n\n', '\n')
         author_name = message.author.display_name

libs/text_cleanup.py

@@ -0,0 +1,31 @@
+import re
+
+_MKD_LINE_BEGINNING = r'^([#>]{1,3} ?)(?P<lb_text>\S+)'
+_MKD_CODE = r'(`+)(?P<code_text>[^`]+)(`+)'
+_MKD_UNDERSCORE = r'(_+)(?P<underscore_text>[^_\n]+)(_+)'
+_MKD_ASTERISK = r'(\*+)(?P<asterisk_text>[^*\n]+)(\*+)'
+_MKD_SPOILER = r'(\|\|)(?P<spoiler_text>[^|\n]+)(\|\|)'
+_MKD_TILDE = r'(~~)(?P<tilde_text>[^~\n]+)(~~)'
+_MKD_FULL_REGEX = re.compile(
+    '(?:' +
+    '|'.join([
+        _MKD_LINE_BEGINNING,
+        _MKD_CODE,
+        _MKD_UNDERSCORE,
+        _MKD_ASTERISK,
+        _MKD_SPOILER,
+        _MKD_TILDE,
+    ])
+     + ')',
+    flags=re.MULTILINE
+)
+
+def _replacement(match: re.Match) -> str:
+    """Replace a markdown match with its content"""
+    for text in match.groupdict().values():
+        if text:
+            return text
+    return ""
+
+def remove_markdown(source: str):
+    return _MKD_FULL_REGEX.sub(_replacement, source)