subs_matcher.rb

dir = ARGV.first || Dir.pwd
Dir.chdir dir unless dir == Dir.pwd

avi_files, srt_files = Dir.glob('*.avi'), Dir.glob('*.srt')

avi_files.each do |avi_file|
  md = avi_file.match /s\d+e\d+/i
  
  if md
    srt_file = srt_files.find {|srt_file| srt_file =~ Regexp.new(md.to_s, true)}
    if srt_file
      name = File.basename avi_file, File.extname(avi_file)
      File.rename srt_file, name+File.extname(srt_file)
    end
  end
end