@foo
@foo_bar_42
@"fo\"o-b
ar"
@'fo\'o-b
ar'
@`fo\`o-b
ar`

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

[
	["variable", "@foo"],
	["variable", "@foo_bar_42"],
	["variable", "@\"fo\\\"o-b\r\nar\""],
	["variable", "@'fo\\'o-b\r\nar'"],
	["variable", "@`fo\\`o-b\r\nar`"]
]

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

Checks for variables.