From 453fc7baa2391e22be3d041d7148b53f6dc1c54f Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 26 Apr 2023 21:07:09 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/markdown_syntax_highlighter.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/gui2/markdown_syntax_highlighter.py b/src/calibre/gui2/markdown_syntax_highlighter.py
index 1eae02e57e..118365550e 100644
--- a/src/calibre/gui2/markdown_syntax_highlighter.py
+++ b/src/calibre/gui2/markdown_syntax_highlighter.py
@@ -14,7 +14,7 @@ from calibre.gui2.palette import dark_link_color, light_link_color
 class MarkdownHighlighter(QSyntaxHighlighter):
 
     MARKDOWN_KEYS_REGEX = {
-        'Bold' : re.compile('(?P<delim>\*\*)(?P<text>.+)(?P=delim)'),
+        'Bold' : re.compile(r'(?P<delim>\*\*)(?P<text>.+)(?P=delim)'),
         'uBold': re.compile('(?P<delim>__)(?P<text>[^_]{2,})(?P=delim)'),
         'Italic': re.compile('(?P<delim>\*)(?P<text>[^*]{2,})(?P=delim)'),
         'uItalic': re.compile('(?P<delim>_)(?P<text>[^_]+)(?P=delim)'),