Encoding text to ASCII with custom fallbacks

gistfile1.rb

# encoding: utf-8

substitutions = Proc.new do |c|
  case c
  when 'ñ' then 'n'
  when 'í' then 'i'
  else '?'
  end
end

puts 'Las castañas son asín o asá'.encode('ASCII', invalid: :replace, crlf_newline: true, fallback: substitutions)