Why is std.regex slow, well here is one reason!

[Dmitry Olshansky]

On Thursday, 23 February 2023 at 23:11:56 UTC, Walter Bright 
wrote:
>> Unicode keeps growing, which is good for compilers, but 
>> horrible for standard libraries!
>
> Unicode is a brilliant idea, but its doom comes from the 
> execrable decision to apply semantic meaning to glyphs.

Its doom comes from its success. Initial design was simple 
enough, and 16 bits should have been enough for everyone. Then 
gradually it got extended towards more and more of writing 
systems, the marvel here is that it managed to:
- remain compatible with earlier versions
- accommodate the vast complexity with fairly few algorithms and 
concepts
- handle technical debt, that is probably what you dislike about 
it, but at the scale of the project it’s inevitable

—
Dmitry Olshansky