I think you can use Angular's linky filter for this: https://docs.angularjs.org/api/ngSanitize/filter/linky
You can use it like so:
<p ng-bind-html="post | linky"></p>
You'll have to include Angular's sanitize module for linky to work:
angular.module('myApp', [
'ngRoute',
'ngSanitize',
'myApp.filters',
...