See embedding a safe unescapable mini perl interpreter?, Evaluating subroutines from within data/Re^3: Evaluating subroutines from within data, http://tt3.template-toolkit.org/talks/tt3-lpw2009/slides/slide36.html Custom Grammars, Inline::Lua, JE / JavaScript::JSLint / http://www.adsafe.org/

I'm not very keen on inventing new syntax :) so I would probably stick with Inline::Lua or something like AdSafe or Template