AngularJS - Slugify Filter

filter.js

(function () {
    'use strict';
 
    angular
        .module('app')
        .filter('slugify', Filter);
 
    function Filter() {
        return function (input) {
            if (!input)
                return;
 
            // make lower case and trim
            var slug = input.toLowerCase().trim();
 
            // replace invalid chars with spaces
            slug = slug.replace(/[^a-z0-9\s-]/g, ' ');
 
            // replace multiple spaces or hyphens with a single hyphen
            slug = slug.replace(/[\s-]+/g, '-');
 
            return slug;
        };
    }
})();

template.html

<a href="{{post._id}}/{{post.title | slugify}}">{{post.title}}</a>