[Issue 23395] Regex leaks memory when used in multithreaded environment

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23395

--- Comment #1 from anon <qigezx+dc40d6nao940k at grr.la> ---
This is especially important when using unit_threaded as this is also when you
want to enable fsan

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