Hi. Any computer language that has parentheses isn't context free. So if you are not in Assembly, it's enough. About context-free - it's tricky question. I wouldn't call it context free because of some macro expansions, for example, the pipe ([[abc (def)|]] -> [[abc (def)|abc]]). The problem I don't know if it will really disturb you, because highlighting should not care about this. The first problem of context-free, templates, should not bother you either, because you do not have template expansion on the page is highlighted, only in "runtime". Even "subst" mechanism does not work before saving. I tried now to find some wikitext syntax constructs that created a "really" context sensitive problems, as text power (find ww for some w), but had not found anything. Any other oppinions?