"" ''
r"" r''
"""""" ''''''
r"""""" r''''''
"fo\"o" 'fo\'o'
"""foo
bar"""
'''foo
bar'''

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

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

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

Checks for single quoted and double quoted strings,
multi-line strings and "raw" strings.