1. replace @ with $
  Find: @
  Replace: $

2. replace mixins
  Find: \.([\w\-]*)\s*\((.*)\)\s*\{
  Replace: @mixin \1\(\2\)\n{

3. replace includes
  Find: \.([\w\-]*\(.*\)\s*;)
  Replace: @include \1

4. replace string literals
  Find: ~"(.*)"
  Replace: #{"\1"}
  
5. 
$import -> @import
$media -> @media
$keyframes -> @keyframes
$-moz- -> @-moz-
$-o- -> @-o-
$-webkit- -> @-webkit-

6. Prevent using $arguments