diff --git a/src/calibre/ebooks/conversion/preprocess.py b/src/calibre/ebooks/conversion/preprocess.py
index da652c1a38..940c27344b 100644
--- a/src/calibre/ebooks/conversion/preprocess.py
+++ b/src/calibre/ebooks/conversion/preprocess.py
@@ -209,7 +209,7 @@ class HTMLPreProcessor(object):
                   (re.compile(ur'\u00a0'), lambda match : ' '),
 
                   # Detect Chapters to match default XPATH in GUI
-                  (re.compile(r'(?=<(/?br|p))(<(/?br|p)[^>]*)?>\s*(?P<chap>(<(i|b)>(<(i|b)>)?)?(.?Chapter|Epilogue|Prologue|Book|Part)\s*([\d\w-]+(\s\w+)?)?(</(i|b)>(</(i|b)>)?)?)</?(br|p)[^>]*>\s*(?P<title>(<(i|b)>)?\s*\w+(\s*\w+)?\s*(</(i|b)>)?\s*(</?(br|p)[^>]*>))?', re.IGNORECASE), chap_head),
+                  (re.compile(r'(?=<(/?br|p))(<(/?br|p)[^>]*)?>\s*(?P<chap>(<(i|b)>(<(i|b)>)?)?(.?Chapter|Epilogue|Prologue|Book|Part|Dedication)\s*([\d\w-]+(\s\w+)?)?(</(i|b)>(</(i|b)>)?)?)</?(br|p)[^>]*>\s*(?P<title>(<(i|b)>)?\s*\w+(\s*\w+)?\s*(</(i|b)>)?\s*(</?(br|p)[^>]*>))?', re.IGNORECASE), chap_head),
                   (re.compile(r'(?=<(/?br|p))(<(/?br|p)[^>]*)?>\s*(?P<chap>([A-Z \'"!]{5,})\s*(\d+|\w+)?)(</?p[^>]*>|<br[^>]*>)\n?((?=(<i>)?\s*\w+(\s+\w+)?(</i>)?(<br[^>]*>|</?p[^>]*>))((?P<title>.*)(<br[^>]*>|</?p[^>]*>)))?'), chap_head),
 
                   # Have paragraphs show better
diff --git a/src/calibre/ebooks/rtf/input.py b/src/calibre/ebooks/rtf/input.py
index dcffbe68ca..eaba28e429 100644
--- a/src/calibre/ebooks/rtf/input.py
+++ b/src/calibre/ebooks/rtf/input.py
@@ -231,12 +231,12 @@ class RTFInput(InputFormatPlugin):
             if self.options.preprocess_html:
                 print "*********  Preprocessing HTML  *********\n"
                 # Detect Chapters to match the xpath in the GUI
-                chapdetect = re.compile(r'<p[^>]*>\s*<span[^>]*>\s*(?P<chap>(<(i|b)><(i|b)>|<(i|b)>)?(.?Chapter|Epilogue|Prologue|Book|Part|Dedication)\s*([\d\w-]+(\s\w+)?)?(</(i|b)></(i|b)>|</(i|b)>)?)\s*</span>\s*</p>', re.IGNORECASE)
+                chapdetect = re.compile(r'<p[^>]*>\s*<span[^>]*>\s*(?P<chap>(<(i|b)>(<(i|b)>)?)?(.?Chapter|Epilogue|Prologue|Book|Part|Dedication)\s*([\d\w-]+(\s\w+)?)?(</(i|b)>(<(/i|b)>)?)?)\s*</span>\s*</p>', re.IGNORECASE)
                 res = chapdetect.sub('<h2>'+'\g<chap>'+'</h2>\n', res)
                 # Unwrap lines using punctation if the median length of all lines is less than 150
                 length = line_length('html', res, 0.4)
                 print "*** Median length is " + str(length) + " ***\n"
-                unwrap = re.compile(r"(?<=.{%i}[a-z,;:\IA])\s*</span>\s*(</p>)?\s*(?P<up2threeblanks><p[^>]*>\s*(<span[^>]*>\s*</span>\s*)</p>\s*){0,3}\s*<p[^>]*>\s*(<span[^>]*>)?\s*" % length, re.UNICODE)
+                unwrap = re.compile(r"(?<=.{%i}[a-z,;:\IA])\s*</span>\s*</p>\s*(?P<up2threeblanks><p[^>]*>\s*(<span[^>]*>\s*</span>\s*)</p>\s*){0,3}\s*<p[^>]*>\s*<span[^>]*>\s*" % length, re.UNICODE)
                 if length < 150:
                     res = unwrap.sub(' ', res)
             f.write(res)