$@
$$<
$(@D)
$(foobar)
$(2)

----------------------------------------------------

[
	["variable", "$@"],
	["variable", "$$<"],
	["variable", "$(@D)"],
	["variable", "$"], ["punctuation", "("], "foobar", ["punctuation", ")"],
	["variable", "$"], ["punctuation", "("], "2", ["punctuation", ")"]
]

----------------------------------------------------

Checks for variables.