Javascript String stringToSlug(str)

// String to slug
String.prototype.stringToSlug = function(str) {
      str = str.replace(/^\s+|\s+$/g, ''); // trim
      str = str.toLowerCase();//  w  w w .  j  a v  a 2  s  .  com
      str = str.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
               .replace(/\s+/g, '-') // collapse whitespace and replace by -
               .replace(/-+/g, '-'); // collapse dashes
      return str;
};