function slug(valor) {
	var url = valor
		.toLowerCase() // change everything to lowercase
		.replace(/^\s+|\s+$/g, "") // trim leading and trailing spaces		
		.replace(/[_|\s]+/g, "-") // change all spaces and underscores to a hyphen
		.replace(/[^a-z0-9-]+/g, "") // remove all non-alphanumeric characters except the hyphen
		.replace(/[-]+/g, "-") // replace multiple instances of the hyphen with a single instance
		.replace(/^-+|-+$/g, "") // trim leading and trailing hyphens				
	;
	return url;
}