Transforms String in URL

friendly_url.js

// Transforms String in URL
function friendly_url(str, max) {
  if (max === undefined) max = 32;
  var a_chars = new Array(
          new Array("a", /[áàâãªÁÀÂÃŪ]/g),
          new Array("e", /[éèêÉÈÊ]/g),
          new Array("i", /[íìîÍÌÎ]/g),
          new Array("o", /[òóôõºÓÒÔÕ°Ö]/g),
          new Array("u", /[úùûÚÙÛµÜü]/g),
          new Array("c", /[çÇ¢©]/g),
          new Array("d", /[Ð]/g),
          new Array("n", /[Ññ]/g),
          new Array("s", /[Šš§]/g),
          new Array("z", /[Žž]/g),
          new Array("y", /[Ÿ¥Ýýÿ]/g),
          new Array("ae", /[Æœæ]/g),
          new Array("ce", /[Œ]/g),
          new Array("r", /[®]/g),
          new Array("0", /[º]/g),
          new Array("1", /[¹]/g),
          new Array("2", /[²]/g),
          new Array("3", /[³]/g)
  );
  // Replace vowel with accent without them
  for (var i = 0; i < a_chars.length; i++) {
    str = str.replace(a_chars[i][1], a_chars[i][0]);
  }
  /* first replace whitespace by -, second remove repeated - by just one, third turn in low case the chars,
   * fourth delete all chars which are not between a-z or 0-9, fifth trim the string and
   * the last step truncate the string to 32 chars
   */
  return str.replace(/\s+/g, '-').toLowerCase().replace(/[^a-z0-9\-]/g, '').replace(/\-{2,}/g, '-').replace(/(^\s*)|(\s*$)/g, '').substr(0, max);
}