* Zorro Lang:

> I was trying to change all these things to [:digit:], [:lower:], [:upper:],
> [:alpha:] and [:alnum:]. But there're many, and the worse thing is there're
> many things like [1-9], [3-8], [1-9a-f], [0-9a-f-] etc...

I finally found a summary of the old discussion I tried to recall:


Ten years on, and we still haven't solved this.

I think it's time to implement the Rational Range Interpretation
across all GNU tools.

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