("")
("foo^"bar")
("foo
bar")
('')
('foo^'bar')
('foo
bar')

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

[
	["expression", [
		["punctuation", "("],
		["string", "\"\""],
		["punctuation", ")"]
	]],
	["expression", [
		["punctuation", "("],
		["string", "\"foo^\"bar\""],
		["punctuation", ")"]
	]],
	["expression", [
		["punctuation", "("],
		["string", "\"foo\r\nbar\""],
		["punctuation", ")"]
	]],
	["expression", [
		["punctuation", "("],
		["string", "''"],
		["punctuation", ")"]
	]],
	["expression", [
		["punctuation", "("],
		["string", "'foo^'bar'"],
		["punctuation", ")"]
	]],
	["expression", [
		["punctuation", "("],
		["string", "'foo\r\nbar'"],
		["punctuation", ")"]
	]]
]

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

Checks for strings inside expressions.