You should definitely avoid mixing server side and client side templates, but if that's too much work, scrubbing would work. You would need to strip the expression stand and end symbols. Default symbols are '{{' and '}}', but some apps use different symbols to avoid collisions with other template engines that use the double curly brace.

The problem ends up being that they mix server side templates with client side templates. If user input is rendered in a server side template and ends up in an element that is part of the Angular scope, the expression will evaluate. So attaching an angular controller to your body tag and then including server side templates within the body, is bad...