CT regex in AA at compile time

[Taylor Hillegeist]

I'm trying to trick the following code snippet into compilation.

enum TokenType{
	//Terminal
	Plus,
	Minus,
	LPer,
	RPer,
	Number,
}

static auto Regexes =[
   TokenType.Plus:   ctRegex!(`^ *\+`),
   TokenType.Minus:  ctRegex!(`^ *\-`),
   TokenType.LPer:   ctRegex!(`^ *\(`),
   TokenType.RPer:   ctRegex!(`^ *\)`),
   TokenType.Number: ctRegex!(`^ *[0-9]+(.[0-9]+)?`)
];

but I can't get it to work. it says its an Error: non-constant 
expression.

I imagine this has to do with the ctRegex template or something. 
maybe there is a better way? Does anyone know?