From 4a2d0685ff90d7325ba7c430753f45b74e408a7b Mon Sep 17 00:00:00 2001
From: Ilya Samartsev <ignz@yandex-team.ru>
Date: Sun, 21 Jun 2020 20:25:32 +0300
Subject: [PATCH] fix more escaping issues

---
 aiogram/utils/text_decorations.py |  2 +-
 tests/test_utils/test_markdown.py | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_utils/test_markdown.py

diff --git a/aiogram/utils/text_decorations.py b/aiogram/utils/text_decorations.py
index 6efa5ed8..3d22f637 100644
--- a/aiogram/utils/text_decorations.py
+++ b/aiogram/utils/text_decorations.py
@@ -163,7 +163,7 @@ class HtmlDecoration(TextDecoration):
 
 
 class MarkdownDecoration(TextDecoration):
-    MARKDOWN_QUOTE_PATTERN: Pattern[str] = re.compile(r"([_*\[\]()~`>#+\-=|{}.!])")
+    MARKDOWN_QUOTE_PATTERN: Pattern[str] = re.compile(r"([_*\[\]()~`>#+\-=|{}.!\\])")
 
     def link(self, value: str, link: str) -> str:
         return f"[{value}]({link})"
diff --git a/tests/test_utils/test_markdown.py b/tests/test_utils/test_markdown.py
new file mode 100644
index 00000000..df0d4f8b
--- /dev/null
+++ b/tests/test_utils/test_markdown.py
@@ -0,0 +1,11 @@
+import pytest
+
+from aiogram.utils import markdown
+
+
+class Test_escape:
+  def test_equality_sign_is_escaped(self):
+    assert markdown.escape_md(r"e = mc2") == r"e \= mc2"
+
+  def test_pre_escaped(self):
+    assert markdown.escape_md(r"hello\.") == r"hello\\\."