Improving std.regex(p)

[BCS]

Hello Ellery,

> Generally I think D's CT capabilities have a way to go yet before this
> would be worth tackling. E.g. how do you build a parse tree if
> pointers and classes aren't allowed in CT code?

You use the type system. I can say from experience that (memory issues aside) 
it works. You can even do duck typing "Template Foo works on anything that 
defines a Bar and a Baz." 

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