Regex to_s.coffee

RegExp.prototype.toString: () ->
  flags: {
    i: @ignoreCase
    g: @global
    m: @multiline
  }
  # Firefox 3 specific flag
  flags.y = @sticky if @sticky?

  [on_flags, off_flags]: ['', '']
  for flag, status of flags
    if status then on_flags += flag else off_flags += flag
  
  "(?$on_flags${if off_flags.length > 0 then "-$off_flags" else ''}:$@source)"


puts /\d+/igm