From 305f5a8acb873999f4098cade648097454e46b58 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 17 Apr 2011 11:16:34 -0600
Subject: [PATCH] ...

---
 src/calibre/ebooks/metadata/sources/base.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/calibre/ebooks/metadata/sources/base.py b/src/calibre/ebooks/metadata/sources/base.py
index f98209e580..9e574614e9 100644
--- a/src/calibre/ebooks/metadata/sources/base.py
+++ b/src/calibre/ebooks/metadata/sources/base.py
@@ -296,10 +296,15 @@ class Source(Plugin):
         if title:
             title_patterns = [(re.compile(pat, re.IGNORECASE), repl) for pat, repl in
             [
+                # Remove things like: (2010) (Omnibus) etc.
                 (r'(?i)[({\[](\d{4}|omnibus|anthology|hardcover|paperback|mass\s*market|edition|ed\.)[\])}]', ''),
+                # Remove commas used a separators in numbers
                 (r'(\d+),(\d+)', r'\1\2'),
+                # Remove hyphens only if they have whitespace before them
                 (r'(\s-)', ' '),
+                # Remove single quotes
                 (r"'", ''),
+                # Replace other special chars with a space
                 (r'''[:,;+!@#$%^&*(){}.`~"\s\[\]/]''', ' ')
             ]]
             for pat, repl in title_patterns: