Fix #2823 (Medata from Filename) and add subtitles to Economist recipe

src/calibre/ebooks/metadata/meta.py

@@ -127,7 +127,7 @@ def metadata_from_filename(name, pat=None):
         except IndexError:
             pass
         try:
-            au = match.group('authors')
+            au = match.group('author')
             aus = string_to_authors(au)
             mi.authors = aus
         except IndexError:

src/calibre/gui2/filename_pattern.ui

@@ -113,7 +113,7 @@ p, li { white-space: pre-wrap; }
         <item row="1" column="1" colspan="2" >
          <widget class="QLineEdit" name="authors" >
           <property name="toolTip" >
-           <string>Regular expression (?P&lt;authors>)</string>
+           <string>Regular expression (?P&lt;author>)</string>
           </property>
           <property name="text" >
            <string>No match</string>

src/calibre/web/feeds/recipes/recipe_economist.py

@@ -63,6 +63,11 @@ class Economist(BasicNewsRecipe):
                 url=a['href'].replace('displaystory', 'PrinterFriendly')
                 if url.startswith('/'):
                     url = 'http://www.economist.com' + url
+                try:
+                   subtitle = tag.previousSibling.contents[0].contents[0]
+                   text = subtitle + ': ' + text
+                except:
+                   pass
                 article = dict(title=text,
                     url = url,
                     description='', content='', date='')