Reading about macro bundles meant to be generic (format agnostic), some of
them work in plain/LaTeX, but crash when loaded on ConTeXt. The following
happens with xstring.tex

tex error > tex error on line 372 in file xstring.tex: ! Illegal parameter
number in definition of \xs_reserved_C


<to be read again>

1

\xs_newlines ->\unexpanded {}\xs_def \xs_arg_i {##1

}

\xs_newmacro_ ...name \xs_myarg }\edef \xs_reserved_C {\unexpanded
\expandafter {\xs_newlines

}\edef \noexpand \xs_call }\edef \xs_reserved_D {...

l.372 \xs_newmacro\StrRemoveBraces{}{1}{1}

{%


<empty file>


You meant to type ## instead of #, right? Or maybe a } was forgotten
somewhere

earlier, and things are all screwed up? I'm going to assume that you meant
##.

I've tried changing the catcode regime, but with no effect.

Don't misunderstand me. I'm aware of ConTeXt capabilities and string
manipulation via Lua. My question is more like: "Why doesn't xstring.tex?"

Sorry if my question is outside the scope of ConTeXt
developers/maintainers. Thank you very much.

Jairo :)