"$foo ${bar} ${'$'} ${foobar()}"
"""
$foo ${bar}
${'$'} ${foobar()}
"""

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

[
	["string", [
		"\"",
		["interpolation", "$foo"],
		["interpolation", [
			["delimiter", "${"], "bar", ["delimiter", "}"]
		]],
		["interpolation", [
			["delimiter", "${"], ["string", "'$'"], ["delimiter", "}"]
		]],
		["interpolation", [
			["delimiter", "${"],
			["function", "foobar"], ["punctuation", "("], ["punctuation", ")"],
			["delimiter", "}"]
		]],
		"\""
	]],
	["raw-string", [
		"\"\"\"\r\n",
		["interpolation", "$foo"],
		["interpolation", [
			["delimiter", "${"], "bar", ["delimiter", "}"]
		]],
		["interpolation", [
			["delimiter", "${"], ["string", "'$'"], ["delimiter", "}"]
		]],
		["interpolation", [
			["delimiter", "${"],
			["function", "foobar"], ["punctuation", "("], ["punctuation", ")"],
			["delimiter", "}"]
		]],
		"\r\n\"\"\""
	]]
]

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

Checks for string interpolation.