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) {        
	        angular.forEach(text.match(replacePattern1), function(url) {
	        	text = text.replace(replacePattern1, "<a href=\"$1\" target=\"_blank\">$1</a>");
	        });
	        angular.forEach(text.match(replacePattern2), function(url) {
	        	text = text.replace(replacePattern2, "$1<a href=\"http://$2\" target=\"_blank\">$2</a>");
	        });
	        angular.forEach(text.match(replacePattern3), function(url) {
	        	text = text.replace(replacePattern3, "<a href=\"mailto:$1\">$1</a>");
	        });

	        return text;        
	    };
	});