filters.js

app.filter('parseUrl', function() {
    var  //URLs starting with http://, https://, or ftp://
      replacePattern1 = /(\b(https?|ftp):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/gim,
        //URLs starting with "www." (without // before it, or it'd re-link the ones done above).
        replacePattern2 = /(^|[^\/])(www\.[\S]+(\b|$))/gim,
        //Change email addresses to mailto:: links.
        replacePattern3 = /(\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,6})/gim;
 
        return function(text, target, otherProp) {
            if(!text) return;
            
            text = text.replace(replacePattern1, "<a href=\"$1\" target=\"_blank\">$1</a>");
            text = text.replace(replacePattern2, "$1<a href=\"http://$2\" target=\"_blank\">$2</a>");
            text = text.replace(replacePattern3, "<a href=\"mailto:$1\">$1</a>");
 
            return text;        
        };
    });