"foo bar"
'foo bar'
"%{REMOTE_HOST}"

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

[
	["string", [
		"\"foo bar\""
	]],
	["string", [
		"'foo bar'"
	]],
	["string", [
		"\"",
		["variable", "%{REMOTE_HOST}"],
		"\""
	]]
]

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

Checks for strings.
Also checks for variables inside strings.