Why can't a Regex object be immutable?

[Shriramana Sharma via Digitalmars-d-learn]

cym13 wrote:

> I think it's because regex() only compiles the regex at runtime
> so it needs to be modified later ; 

Aw come on. The immutability of the variable is *after* it has been created 
at runtime.

> > you'll find that using
> ctRegex() instead will allow you to declare it immutable for
> example. I didn't look at the implementation to identify a
> precise cause though.

You mean ctRegex!(), but nope:

    immutable numbers = ctRegex!r"\d+";

or doing const there gives the same error and using auto doesn't.

-- 
Shriramana Sharma, Penguin #395953