---
foo: ""
bar: "fo\"obar"
foo: ''
bar: 'fo\'obar'

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

[
	["punctuation", "---"],
	["key", "foo"], ["punctuation", ":"],
	["string", "\"\""],
	["key", "bar"], ["punctuation", ":"],
	["string", "\"fo\\\"obar\""],
	["key", "foo"], ["punctuation", ":"],
	["string", "''"],
	["key", "bar"], ["punctuation", ":"],
	["string", "'fo\\'obar'"]
]

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

Checks for strings.