From 1c24a53865ad76672cea08ef3ff2e9e5e4e93b42 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 15 Apr 2021 13:16:53 +0530
Subject: [PATCH] FB2 Output: Fix a regression in calibre 5 that caused
 paragraphs containing only non-breaking spaces to be removed. Fixes #1924232
 [Empty lines missing after FB2
 conversion](https://bugs.launchpad.net/calibre/+bug/1924232)

py3 compat
\s+ matches nbsp in python 3 but not python2
---
 src/calibre/ebooks/fb2/fb2ml.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/fb2/fb2ml.py b/src/calibre/ebooks/fb2/fb2ml.py
index 46e52fdd13..8b74efe9e7 100644
--- a/src/calibre/ebooks/fb2/fb2ml.py
+++ b/src/calibre/ebooks/fb2/fb2ml.py
@@ -79,7 +79,7 @@ class FB2MLizer(object):
         text = re.sub(r'(?mu)<(strong|emphasis|strikethrough|sub|sup)>(\s*)</\1>', r'\2', text)
 
         # Clean up paragraphs endings.
-        text = re.sub(r'(?mu)\s+</p>', '</p>', text)
+        text = re.sub(r'(?ma)\s+</p>', '</p>', text)
         # Condense empty paragraphs into a line break.
         text = re.sub(r'(?mu)(?:<p></p>\s*){3,}', '<empty-line/>', text)
         # Remove empty paragraphs.