From b6b48ec8f92b7dfee6aa00815ebea8b15c00ab64 Mon Sep 17 00:00:00 2001
From: Lars Eggert <lars@eggert.org>
Date: Sat, 5 Nov 2022 17:22:56 +0000
Subject: [PATCH] fix: Only allow a single newline in when URLizing RFC tags
 (#4710)

Fixes #4705
---
 ietf/doc/templatetags/ietf_filters.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ietf/doc/templatetags/ietf_filters.py b/ietf/doc/templatetags/ietf_filters.py
index f472f8b03..9c73840b1 100644
--- a/ietf/doc/templatetags/ietf_filters.py
+++ b/ietf/doc/templatetags/ietf_filters.py
@@ -249,7 +249,7 @@ def urlize_ietf_docs(string, autoescape=None):
         flags=re.IGNORECASE | re.ASCII,
     )
     string = re.sub(
-        r"\b(?<![/\-:=#\"\'])((RFC|BCP|STD|FYI)\s*0*(\d+))\b",
+        r"\b(?<![/\-:=#\"\'])((RFC|BCP|STD|FYI) *\n? *0*(\d+))\b",
         link_other_doc_match,
         string,
         flags=re.IGNORECASE | re.ASCII,