""
"fo\"obar"
''
'fo\'obar'
"fo\" # comment obar"

r"\n"
b'foo'
rb"foo\n"
u"foo"

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

[
	["string", "\"\""],
	["string", "\"fo\\\"obar\""],
	["string", "''"],
	["string", "'fo\\'obar'"],
	["string", "\"fo\\\" # comment obar\""],

	["string", "r\"\\n\""],
	["string", "b'foo'"],
	["string", "rb\"foo\\n\""],
	["string", "u\"foo\""]
]

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

Checks for strings.