I'm not familiar with the MediaWiki sandbox, but did you
give LuLPeg a
try? It is a pure Lua implementation.
If the sandbox is based on Lua 5.1 and disables `newproxy()`,
you'll have to use LuLPeg.L(LuLPeg.P(...))
rather than #LuLPeg.P(...)
Otherwise, it is compatible, but slower.
Thank you for this information. Unfortunately, this library depends
on load () and loadstring () functions, among others, switched off
By the way, I found the reason why getmetatable (lpeg.P()) == nil.
Scribunto also altered getmetatable () to return nils for all
datatypes save table. So, the issue now is how to export this
metatable from C++ to Lua global space so it could be addressed by