From a20cd3336dc5a309543dd5134a4f85bf563b9b09 Mon Sep 17 00:00:00 2001
From: ldolse <ldolse@yahoo.com>
Date: Mon, 24 Jan 2011 13:47:53 +0800
Subject: [PATCH] improved negative lookaheads in heuristics

---
 src/calibre/ebooks/conversion/utils.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/calibre/ebooks/conversion/utils.py b/src/calibre/ebooks/conversion/utils.py
index e8c2acb9d6..22639801ff 100644
--- a/src/calibre/ebooks/conversion/utils.py
+++ b/src/calibre/ebooks/conversion/utils.py
@@ -203,8 +203,8 @@ class HeuristicProcessor(object):
             blank_lines = ""
         opt_title_open = "("
         opt_title_close = ")?"
-        n_lookahead_open = "\s+(?!"
-        n_lookahead_close = ")"
+        n_lookahead_open = "(?!\s*"
+        n_lookahead_close = ")\s*"
 
         default_title = r"(<[ibu][^>]*>)?\s{0,3}(?!Chapter)([\w\:\'’\"-]+\s{0,3}){1,5}?(</[ibu][^>]*>)?(?=<)"
         simple_title = r"(<[ibu][^>]*>)?\s{0,3}(?!(Chapter|\s+<)).{0,65}?(</[ibu][^>]*>)?(?=<)"