Javascript Slugify function.

slugify.js

String.prototype.slugify = function()
{
  var p = ['.', '=', '-'];
  var s = '-';

  //now we need to do some fiddling with special characters
  var replaceArray = {
    'a': /à|á|å|â/,
    'e': /è|é|ê|ẽ|ë/,
    'i': /ì|í|î/,
    'o': /ò|ó|ô|ø/,
    'u': /ù|ú|ů|û/,
    'c': /ç/,
    'n': /ñ/,
    'ae': /ä|æ/,
    'oe': /ö/,
    'ue': /ü/,
    'Ae': /Ä/,
    'Ue': /Ü/,
    'Oe': /Ö/,
    'ss': /ß/,
    'and': /&/
  }
  var string = this;
  
  //replace the strings
  for(var k in replaceArray){
    string = string.replace(replaceArray[k], k);
  }

  return string.toLowerCase().
    replace(new RegExp('[' + p.join('') + ']', 'g'), ' ').    //  replace preserved characters with spaces
    replace(/-{2,}/g, ' ').     //  remove duplicate spaces
    replace(/^\s\s*/, '').replace(/\s\s*$/, '').    //  trim both sides of string
    replace(/[^\w\ ]/gi, '').   //  replaces all non-alphanumeric with empty string
    replace(/  /gi, ' ').
    replace(/[\ ]/gi, s);    //  Convert spaces to dashes
}