""
''
"f\"oo"
'b\'ar'
"foo\
bar"
'foo\
bar'
"foo /* comment */ bar"
'foo // bar'
'foo // bar' //comment

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

[
	["string", "\"\""],
	["string", "''"],
	["string", "\"f\\\"oo\""],
	["string", "'b\\'ar'"],
	["string", "\"foo\\\r\nbar\""],
	["string", "'foo\\\r\nbar'"],
	["string", "\"foo /* comment */ bar\""],
	["string", "'foo // bar'"],
	["string", "'foo // bar'"],
	["comment", "//comment"]
]

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

Checks for empty strings, single-line strings and
multi-line strings, both single-quoted and double-quoted.