[foo]http://prismjs.com
[bar]http://www.example.com

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

[
	["phrase", [
		["link-ref", [
			["punctuation", "["],
			["string", "foo"],
			["punctuation", "]"],
			["url", "http://prismjs.com"]
		]],
		["link-ref", [
			["punctuation", "["],
			["string", "bar"],
			["punctuation", "]"],
			["url", "http://www.example.com"]
		]]
	]]
]

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

Checks for links references.