Rails - Oct 2006 - Why don't match and scan work properly in AR?

I''m trying this in the save method of an ActiveRecord object:

  def save
    f = self.file

    self.file_extension = f.match(/\.(.+?)$/)[1] if self.file # returns 
entire file name
    self.file_extension = f.scan(/\.(.+?)$/)[0][0] if self.file # 
returns entire file name
    self.file_extension = f[f.rindex(''.'')+1, f.length] #
works!

    super

    if self.file
      FileUtils.cp(self.file, self.file_path)
      FileUtils.chmod(FILE_MODE, self.file_path)
    end
  end

As you can see by my comments, the first two return the entire file 
name. I''ve done the same two equivalent lines in script/console and
they
both return the extension I''m looking for. Any idea why they behave 
differently in ActiveRecord?

Thanks,
Joe

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