diff --git a/src/calibre/ebooks/conversion/preprocess.py b/src/calibre/ebooks/conversion/preprocess.py
index 39ca28e87f..b63c7ca861 100644
--- a/src/calibre/ebooks/conversion/preprocess.py
+++ b/src/calibre/ebooks/conversion/preprocess.py
@@ -228,17 +228,16 @@ class HTMLPreProcessor(object):
         else:
             rules = []
 
-        pre_rules = []
+        end_rules = []
         if getattr(self.extra_opts, 'remove_header', None):
-            pre_rules.append(
+            end_rules.append(
                 (re.compile(getattr(self.extra_opts, 'header_regex')), lambda match : '')
             )
         if getattr(self.extra_opts, 'remove_footer', None):
-            pre_rules.append(
+            end_rules.append(
                 (re.compile(getattr(self.extra_opts, 'footer_regex')), lambda match : '')
             )
-
-        end_rules = []
+        
         if getattr(self.extra_opts, 'unwrap_factor', 0.0) > 0.01:
             length = line_length(html, getattr(self.extra_opts, 'unwrap_factor'))
             if length:
@@ -247,7 +246,7 @@ class HTMLPreProcessor(object):
                     (re.compile(r'(?<=.{%i}[a-z\.,;:)-IA])\s*(?P<ital></(i|b|u)>)?\s*(<p.*?>)\s*(?=(<(i|b|u)>)?\s*[\w\d(])' % length, re.UNICODE), wrap_lines),
                 )
 
-        for rule in self.PREPROCESS + pre_rules + rules + end_rules:
+        for rule in self.PREPROCESS + rules + end_rules:
             html = rule[0].sub(rule[1], html)
 
         # Handle broken XHTML w/ SVG (ugh)
diff --git a/src/calibre/ebooks/oeb/iterator.py b/src/calibre/ebooks/oeb/iterator.py
index 762b14c3e5..565ceed519 100644
--- a/src/calibre/ebooks/oeb/iterator.py
+++ b/src/calibre/ebooks/oeb/iterator.py
@@ -123,7 +123,7 @@ class EbookIterator(object):
                                 else:
                                     print 'Loaded embedded font:', repr(family)
 
-    def __enter__(self, raw_only=False):
+    def __enter__(self, processed=False):
         self.delete_on_exit = []
         self._tdir = TemporaryDirectory('_ebook_iter')
         self.base  = self._tdir.__enter__()
@@ -140,7 +140,7 @@ class EbookIterator(object):
                 plumber.opts, plumber.input_fmt, self.log,
                 {}, self.base)
 
-        if not raw_only and plumber.input_fmt.lower() in ('pdf', 'rb'):
+        if processed or plumber.input_fmt.lower() in ('pdf', 'rb'):
             self.pathtoopf = create_oebbook(self.log, self.pathtoopf, plumber.opts,
                     plumber.input_plugin)
         if hasattr(self.pathtoopf, 'manifest'):
diff --git a/src/calibre/gui2/convert/regex_builder.py b/src/calibre/gui2/convert/regex_builder.py
index 20da8d7aaf..b1d8fbcbd5 100644
--- a/src/calibre/gui2/convert/regex_builder.py
+++ b/src/calibre/gui2/convert/regex_builder.py
@@ -87,12 +87,12 @@ class RegexBuilder(QDialog, Ui_RegexBuilder):
 
     def open_book(self, pathtoebook):
         self.iterator = EbookIterator(pathtoebook)
-        self.iterator.__enter__(raw_only=True)
+        self.iterator.__enter__(processed=True)
         text = [u'']
         for path in self.iterator.spine:
-            html = open(path, 'rb').read().decode(path.encoding, 'replace')
+            html = open(path, 'rb').read().decode('utf-8', 'replace')
             text.append(html)
-        self.preview.setPlainText('\n\n'.join(text))
+        self.preview.setPlainText('\n---\n'.join(text))
 
     def button_clicked(self, button):
         if button == self.button_box.button(QDialogButtonBox.Open):