Snippet interessante para analisar uma string em um valor pronto para slug
function string_to_slug(str) {
str = str.replace(/^s+|s+$/g, ''); // trim
str = str.toLowerCase();
// remove accents, swap ñ for n, etc
var from = "àáãäâèéëêìíïîòõóöôùúüûñç·/_,:;";
var to = "aaaaaeeeeiiiiooooouuuunc------";
for (var i=0, l=from.length ; i<l ; i++) {
str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
}
str = str.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
.replace(/s+/g, '-') // collapse whitespace and replace by -
.replace(/-+/g, '-'); // collapse dashes
return str;
}