diff --git a/beetsplug/fromfilename.py b/beetsplug/fromfilename.py
index ea43129aa..56b68f756 100644
--- a/beetsplug/fromfilename.py
+++ b/beetsplug/fromfilename.py
@@ -27,16 +27,16 @@ import six
 
 # Filename field extraction patterns.
 PATTERNS = [
-    # Useful patterns.
-    r'^(?P<artist>.+)[\-_](?P<title>.+)[\-_](?P<tag>.*)$',
-    r'^(?P<track>\d+)[\s.\-_]+(?P<artist>.+)[\-_](?P<title>.+)[\-_](?P<tag>.*)$',
-    r'^(?P<artist>.+)[\-_](?P<title>.+)$',
-    r'^(?P<track>\d+)[\s.\-_]+(?P<artist>.+)[\-_](?P<title>.+)$',
-    r'^(?P<title>.+)$',
-    r'^(?P<track>\d+)[\s.\-_]+(?P<title>.+)$',
-    r'^(?P<track>\d+)\s+(?P<title>.+)$',
-    r'^(?P<title>.+) by (?P<artist>.+)$',
-    r'^(?P<track>\d+).*$',
+  # Useful patterns.
+  r'^(?P<artist>.+)[\-_](?P<title>.+)[\-_](?P<tag>.*)$',
+  r'^(?P<track>\d+)[\s.\-_]+(?P<artist>.+)[\-_](?P<title>.+)[\-_](?P<tag>.*)$',
+  r'^(?P<artist>.+)[\-_](?P<title>.+)$',
+  r'^(?P<track>\d+)[\s.\-_]+(?P<artist>.+)[\-_](?P<title>.+)$',
+  r'^(?P<title>.+)$',
+  r'^(?P<track>\d+)[\s.\-_]+(?P<title>.+)$',
+  r'^(?P<track>\d+)\s+(?P<title>.+)$',
+  r'^(?P<title>.+) by (?P<artist>.+)$',
+  r'^(?P<track>\d+).*$',
 ]
 
 # Titles considered "empty" and in need of replacement.