$foo
$foo-bar
$foo_bar
#{$foo}
#{$foo-bar}
#{$foo_bar}

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

[
	["variable", "$foo"],
	["variable", "$foo-bar"],
	["variable", "$foo_bar"],
	["variable", "#{$foo}"],
	["variable", "#{$foo-bar}"],
	["variable", "#{$foo_bar}"]
]

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

Checks for variables.