[Issue 12844] Absurd RAM Required for ctRegex

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12844

--- Comment #6 from Orvid King <blah38621 at gmail.com> ---
Perhaps it would be possible to simulate a character set cache by using a 
template to represent the set of characters included?

For the runtime version, is there any real reason to force the charset cache to 
be thread local? Could it perhaps be global with dirty read and a possible 
re-calculation? 

>From my experience, most nievely implemented caching mechanisms fail to 
understand that a best-effort cache is usually more than enough.

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