$foo
$#foo

${^POSTMATCH}

$^V

@1
$42

$$
$_
%!

%'foo
$foo'bar

$::::'foo
$foo::'bar

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

[
	["variable", "$foo"],
	["variable", "$#foo"],

	["variable", "${^POSTMATCH}"],

	["variable", "$^V"],

	["variable", "@1"],
	["variable", "$42"],

	["variable", "$$"],
	["variable", "$_"],
	["variable", "%!"],

	["variable", "%'foo"],
	["variable", "$foo'bar"],

	["variable", "$::::'foo"],
	["variable", "$foo::'bar"]
]

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

Checks for variables.