foo()
foo ()
foo_bar()
foo_bar ( )
f42()
_()
$()
ಠ_ಠ()
Ƞȡ_҇()
if(notAFunction)

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

[
	["function", "foo"], ["punctuation", "("], ["punctuation", ")"],
	["function", "foo"], ["punctuation", "("], ["punctuation", ")"],
	["function", "foo_bar"], ["punctuation", "("], ["punctuation", ")"],
	["function", "foo_bar"], ["punctuation", "("], ["punctuation", ")"],
	["function", "f42"], ["punctuation", "("], ["punctuation", ")"],
	["function", "_"], ["punctuation", "("], ["punctuation", ")"],
	["function", "$"], ["punctuation", "("], ["punctuation", ")"],
	["function", "ಠ_ಠ"], ["punctuation", "("], ["punctuation", ")"],
	["function", "Ƞȡ_҇"], ["punctuation", "("], ["punctuation", ")"],
	["keyword", "if"], ["punctuation", "("], "notAFunction", ["punctuation", ")"]
]

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

Checks for functions. Also checks for unicode characters in identifiers.