lib/nanoc/data_sources/filesystem.rb in nanoc-4.0.2 vs lib/nanoc/data_sources/filesystem.rb in nanoc-4.1.0a1

@@ -190,10 +190,10 @@
     end
 
     # Returns the extension(s) of filename. Supports multiple extensions.
     # Includes the leading period.
     def ext_of(filename)
-      filename =~ extension_regex ? $1 : ''
+      filename =~ extension_regex ? Regexp.last_match[1] : ''
     end
 
     # Returns a regex that is used for determining the extension of a file
     # name. The first match group will be the entire extension, including the
     # leading period.