$_
$foo
$BAR?
$Baz_42!

@_
@foo
@BAR?
@Baz_42!

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

[
	["variable", "$_"],
	["variable", "$foo"],
	["variable", "$BAR?"],
	["variable", "$Baz_42!"],

	["variable", "@_"],
	["variable", "@foo"],
	["variable", "@BAR?"],
	["variable", "@Baz_42!"]
]

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

Checks for variables.