Translate special characters to ASCII characters in Ruby.

slugify.rb

  def slugify(text)
    accents = {
      ['à','á','â','ã','å','ǻ','ā','ă','ą','ǎ','ª'] => 'a',
      ['ä','æ','ǽ'] => 'ae',
      ['Æ','Ǽ'] => 'AE',
      ['Ä'] => 'Ae',
      ['Ü'] => 'Ue',
      ['Ç','Ć','Ĉ','Ċ','Č'] => 'C',
      ['ç','ć','ĉ','ċ','č'] => 'c',
      ['Ð','Ď','Đ'] => 'D',
      ['ð','ď','đ'] => 'd',
      ['È','É','Ê','Ë','Ē','Ĕ','Ė','Ę','Ě'] => 'E',
      ['è','é','ê','ë','ē','ĕ','ė','ę','ě'] => 'e',
      ['ƒ'] => 'f',
      ['Ĝ','Ğ','Ġ','Ģ'] => 'G',
      ['ĝ','ğ','ġ','ģ'] => 'g',
      ['Ĥ','Ħ'] => 'H',
      ['ĥ','ħ'] => 'h',
      ['Ì','Í','Î','Ï','Ĩ','Ī','Ĭ','Ǐ','Į','İ'] => 'I',
      ['ì','í','î','ï','ĩ','ī','ĭ','ǐ','į','ı'] => 'i',
      ['IJ'] => 'IJ',
      ['ij'] => 'ij',
      ['Ĵ'] => 'J',
      ['ĵ'] => 'j',
      ['Ķ'] => 'K',
      ['ķ'] => 'k',
      ['Ĺ','Ļ','Ľ','Ŀ','Ł'] => 'L',
      ['ĺ','ļ','ľ','ŀ','ł'] => 'l',
      ['Ñ','Ń','Ņ','Ň'] => 'N',
      ['ñ','ń','ņ','ň','ʼn'] => 'n',
      ['Ò','Ó','Ô','Õ','Ō','Ŏ','Ǒ','Ő','Ơ','Ø','Ǿ','Ö'] => 'O',
      ['ò','ó','ô','õ','ō','ŏ','ǒ','ő','ơ','ø','ǿ','º','ö'] => 'o',
      ['Œ'] => 'OE',
      ['œ'] => 'oe',
      ['Ŕ','Ŗ','Ř'] => 'R',
      ['ŕ','ŗ','ř'] => 'r',
      ['Ś','Ŝ','Ş','Š'] => 'S',
      ['ś','ŝ','ş','š','ſ'] => 's',
      ['ß'] => 'ss',
      ['Ţ','Ť','Ŧ'] => 'T',
      ['ţ','ť','ŧ'] => 't',
      ['Ù','Ú','Û','Ũ','Ū','Ŭ','Ů','Ű','Ų','Ư','Ǔ','Ǖ','Ǘ','Ǚ','Ǜ','Ü'] => 'U',
      ['ù','ú','û','ũ','ū','ŭ','ů','ű','ų','ư','ǔ','ǖ','ǘ','ǚ','ǜ','ü'] => 'u',
      ['Ý','Ÿ','Ŷ'] => 'Y',
      ['ý','ÿ','ŷ'] => 'y',
      ['Ŵ'] => 'W',
      ['ŵ'] => 'w',
      ['Ź','Ż','Ž'] => 'Z',
      ['ź','ż','ž'] => 'z'
    }
 
    accents.each do |ac,rep|
      ac.each do |s|
        text = text.gsub(s, rep)
      end
    end
 
    text = text.gsub(/[^a-zA-Z0-9 ]/, "")
    text = text.gsub(/[ ]+/, " ")    
    text = text.gsub(/ /, "-")
    text = text.downcase
  end