url('foo.png')
font-url('foo.ttf')

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

[
	["url", "url"],
	["punctuation", "("],
	["string", "'foo.png'"],
	["punctuation", ")"],
	["url", "font-url"],
	["punctuation", "("],
	["string", "'foo.ttf'"],
	["punctuation", ")"]
]

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

Checks for URLs.