From 8e159a97736633d16a771119007d1f0741fdbf6b Mon Sep 17 00:00:00 2001
From: YooooEX <me@yooooex.com>
Date: Fri, 24 Apr 2026 16:24:21 +0800
Subject: [PATCH] feat(tgapp): add support for __ bold and ~~ strikethrough
 styles

---
 frontends/tgapp.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/frontends/tgapp.py b/frontends/tgapp.py
index 8e1fa79..d52caf6 100644
--- a/frontends/tgapp.py
+++ b/frontends/tgapp.py
@@ -40,6 +40,8 @@ _MD_TOKEN_RE = re.compile(
     r"|\[([^\]]+)\]\(([^)\n]+)\)"
     r"|`([^`\n]+)`"
     r"|\*\*([^\n]+?)\*\*"
+    r"|__([^\n]+?)__"
+    r"|~~([^\n]+?)~~"
     r"|(?<!\*)\*(?!\*)([^\n]+?)(?<!\*)\*(?!\*)",
     re.DOTALL,
 )
@@ -97,7 +99,11 @@ def _to_markdown_v2(text):
         elif match.group(7) is not None:
             parts.append(f"*{escape_markdown(match.group(7), version=2)}*")
         elif match.group(8) is not None:
-            parts.append(f"_{escape_markdown(match.group(8), version=2)}_")
+            parts.append(f"*{escape_markdown(match.group(8), version=2)}*")
+        elif match.group(9) is not None:
+            parts.append(f"~{escape_markdown(match.group(9), version=2)}~")
+        elif match.group(10) is not None:
+            parts.append(f"_{escape_markdown(match.group(10), version=2)}_")
         pos = match.end()
     parts.append(escape_markdown(text[pos:], version=2))
     return "".join(parts)