/[foo]\/bar/gim
/[bar]/,
/./i;
%r!foo?bar#{39+3}!
%r(foo?bar#{39+3})
%r{foo?bar#{39+3}}
%r[foo?bar#{39+3}]
%r<foo?bar#{39+3}>

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

[
	["regex", "/[foo]\\/bar/gim"],
	["regex", "/[bar]/"], ["punctuation", ","],
	["regex", "/./i"], ["punctuation", ";"],
	["regex", ["%r!foo?bar", ["interpolation", [
		["delimiter", "#{"],
		["number", "39"], ["operator", "+"], ["number", "3"],
		["delimiter", "}"]
	]], "!"]],
	["regex", ["%r(foo?bar", ["interpolation", [
		["delimiter", "#{"],
		["number", "39"], ["operator", "+"], ["number", "3"],
		["delimiter", "}"]
	]], ")"]],
	["regex", ["%r{foo?bar", ["interpolation", [
		["delimiter", "#{"],
		["number", "39"], ["operator", "+"], ["number", "3"],
		["delimiter", "}"]
	]], "}"]],
	["regex", ["%r[foo?bar", ["interpolation", [
		["delimiter", "#{"],
		["number", "39"], ["operator", "+"], ["number", "3"],
		["delimiter", "}"]
	]], "]"]],
	["regex", ["%r<foo?bar", ["interpolation", [
		["delimiter", "#{"],
		["number", "39"], ["operator", "+"], ["number", "3"],
		["delimiter", "}"]
	]], ">"]]
]

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

Checks for regex.