From bebcf71bdc179148820bb90fa9262b93986293fe Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Wed, 12 Apr 2023 17:52:12 +0100
Subject: [PATCH] LibMarkdown: Avoid catastrophic backtracking in thematic
 break regex

Fixes #17937
---
 Userland/Libraries/LibMarkdown/HorizontalRule.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibMarkdown/HorizontalRule.cpp b/Userland/Libraries/LibMarkdown/HorizontalRule.cpp
index 472cfa9573..4c37a0ad85 100644
--- a/Userland/Libraries/LibMarkdown/HorizontalRule.cpp
+++ b/Userland/Libraries/LibMarkdown/HorizontalRule.cpp
@@ -35,7 +35,7 @@ RecursionDecision HorizontalRule::walk(Visitor& visitor) const
     return RecursionDecision::Continue;
 }
 
-static Regex<ECMA262> thematic_break_re("^ {0,3}([\\*\\-_])(\\s*\\1\\s*){2,}$");
+static Regex<ECMA262> thematic_break_re("^ {0,3}([\\*\\-_])\\s*(\\1\\s*){2,}$");
 
 OwnPtr<HorizontalRule> HorizontalRule::parse(LineIterator& lines)
 {