While I know you mean sexps, ordinary Tcl itself has a lot of Lisp-like features that I didn't really understand when I was using it in the 1990s -- it's a lot

While I know you mean sexps, ordinary Tcl itself has a lot of Lisp-like features that I didn't really understand when I was using it in the 1990s -- it's a lot closer to Lisp than it is to something like Perl which it resembles more superficially.