From e8c57ebd9c6da23c5d30a72df4ee9141a801402d Mon Sep 17 00:00:00 2001
From: Cameron <cameron@pfiffer.org>
Date: Mon, 9 Mar 2026 21:47:48 -0700
Subject: [PATCH] fix: avoid false italic conversion in Telegram reasoning
 (#526)

---
 src/core/display.test.ts | 8 ++++++++
 src/core/display.ts      | 7 +++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/core/display.test.ts b/src/core/display.test.ts
index 4057a59..4ca4b93 100644
--- a/src/core/display.test.ts
+++ b/src/core/display.test.ts
@@ -96,6 +96,14 @@ describe('formatReasoningDisplay', () => {
     );
   });
 
+  it('does not convert math-like asterisks to telegram italic formatting', () => {
+    const spaced = formatReasoningDisplay('2 * 3 * 4', 'telegram');
+    const compact = formatReasoningDisplay('2*3*4', 'telegram');
+    expect(spaced.parseMode).toBe('HTML');
+    expect(spaced.text).toBe('<blockquote expandable><b>Thinking</b>\n2 * 3 * 4</blockquote>');
+    expect(compact.text).toBe('<blockquote expandable><b>Thinking</b>\n2*3*4</blockquote>');
+  });
+
   it('formats non-signal/telegram channels as markdown blockquote', () => {
     const result = formatReasoningDisplay('line 1\n line 2', 'discord');
     expect(result).toEqual({ text: '> **Thinking**\n> line 1\n> line 2' });
diff --git a/src/core/display.ts b/src/core/display.ts
index edde551..ecae3cd 100644
--- a/src/core/display.ts
+++ b/src/core/display.ts
@@ -239,8 +239,11 @@ export function formatReasoningDisplay(
       .replace(/</g, '&lt;')
       .replace(/>/g, '&gt;');
     const html = escaped
-      .replace(/\*\*(.+?)\*\*/g, '<b>$1</b>')
-      .replace(/\*(.+?)\*/g, '<i>$1</i>');
+      // Only convert likely markdown delimiters:
+      // - ignore escaped asterisks (\*)
+      // - ignore in-word/math operators (e.g., 2*3*4, 2 * 3 * 4)
+      .replace(/(?<![\\\w])\*\*(?=\S)([\s\S]*?\S)\*\*(?!\w)/g, '<b>$1</b>')
+      .replace(/(?<![\\\w])\*(?=\S)([^*\n]*?\S)\*(?!\w)/g, '<i>$1</i>');
     return {
       text: `<blockquote expandable><b>Thinking</b>\n${html}</blockquote>`,
       parseMode: 'HTML',