ietf-nntp Simplification of wildmat
Clive D.W. Feather
clive at demon.net
Fri May 4 01:51:20 PDT 2001
Maurizio Codogno said:
> I prefer to avoid the sets, ant therefore I vote for version 5b.
> The reason is that I prefer a simpler grammar: I shudder when I see
> [^a-dx-p] all one character strings except "a", "b", "c", and "d"
That's an implication of the "z-a means nothing" rule.
> ISO 10646/UTF8 collating is a mess, IMO, and I don't want to try it
> on a wildmat.
We collate in strict numerical order. UTF8 collates simply and obviously
when you do that (that is, strcmp() will produce the correct result).
> Besides, I don't see examples where sets are actually needed:
> in practice, it should always be possible to unfold the set and
> obtain a not-too-long wildmat.
How do you unfold "alt.[^x]*" into something not-too-long ?
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