updated the regex to support nested files and refactored some unclear functions

lib/compass/sass_extensions/sprites/sprite_map.rb

@@ -25,7 +25,7 @@ module Compass
     
     # Returns the Glob of image files for this sprite
     def files
-      @files ||= Dir[File.join(Compass.configuration.images_path, uri).gsub('/*', '/**/*')].sort
+      @files ||= Dir[File.join(Compass.configuration.images_path, uri)].sort
     end
 
     # Returns an Array of image names without the file extension

lib/compass/sass_extensions/sprites/sprites.rb

@@ -3,8 +3,8 @@ module Compass
     attr_accessor :name, :path
     
     def self.path_and_name(uri)
-      if uri =~ %r{((.+/)?(.+))/(.+?)\.png}
-        [$1, $3, $4]
+      if uri =~ %r{((.+/)?([^\*.]+))/(.+?)\.png}
+        [$1, $3]
       end
     end
     

test/integrations/sprites_test.rb

@@ -590,7 +590,7 @@ class SpritesTest < Test::Unit::TestCase
   
   it "should generate a sprite from nested folders" do
     css = render <<-SCSS
-      @import "nested/*.png";
+      @import "nested/**/*.png";
       @include all-nested-sprites;
     SCSS
     assert_correct css, <<-CSS