""
"fo\"o"

@""
@"foo"
@"fo""o"
@"foo
bar"

'a'
'\''
'\\'

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

[
	["string", "\"\""],
	["string", "\"fo\\\"o\""],

	["string", "@\"\""],
	["string", "@\"foo\""],
	["string", "@\"fo\"\"o\""],
	["string", "@\"foo\r\nbar\""],
	["string", "'a'"],
	["string", "'\\''"],
	["string", "'\\\\'"]
]

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

Checks for normal and verbatim strings.
Also checks for single quoted characters.