Formatting and anchoring the extension gsub to the end

lib/paperclip/attachment.rb

@@ -74,11 +74,11 @@ def assign uploaded_file
       return nil if uploaded_file.nil?
 
       logger.info("[paperclip] Writing attributes for #{name}")
-      @queued_for_write[:original]        = uploaded_file.to_tempfile
-      instance_write(:file_name, uploaded_file.original_filename.strip.gsub(/[^\w\d\.\-]+/, '_'))
-      instance_write(:content_type, uploaded_file.content_type.strip)
-      instance_write(:file_size, uploaded_file.size.to_i)
-      instance_write(:updated_at, Time.now)
+      @queued_for_write[:original]   = uploaded_file.to_tempfile
+      instance_write(:file_name,       uploaded_file.original_filename.strip.gsub(/[^\w\d\.\-]+/, '_'))
+      instance_write(:content_type,    uploaded_file.content_type.strip)
+      instance_write(:file_size,       uploaded_file.size.to_i)
+      instance_write(:updated_at,      Time.now)
 
       @dirty = true
 
@@ -169,7 +169,7 @@ def self.interpolations
                            attachment.instance.class.name.underscore.pluralize
                          end,
         :basename     => lambda do |attachment,style|
-                           attachment.original_filename.gsub(File.extname(attachment.original_filename), "")
+                           attachment.original_filename.gsub(/#{File.extname(attachment.original_filename)}$/, "")
                          end,
         :extension    => lambda do |attachment,style| 
                            ((style = attachment.styles[style]) && style.last) ||

test/attachment_test.rb

@@ -174,7 +174,6 @@ class AttachmentTest < Test::Unit::TestCase
     should "strip whitespace from content_type field" do
       assert_equal "image/png", @dummy.avatar.instance.avatar_content_type
     end
-
   end
 
   context "Attachment with strange letters" do