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Comment by iogf | Hacker News Reader

I may add synonyms for those classes, so, it is just a matter of adding:

Repeat = Times

etc.

you wouldnt use these structures in python code, you use them to build your regex then compile it and use the regex in your programs. It is possible to add some type safety and messages to help debugging which would be better than with natural regex syntax.

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Seq stands for a-z or 0-9 which can be used only in Include and Exclude. When you write Include(Seq('a', 'm')) it means you are including a character from that sequence in a given position of your pattern. So if you have

Pattern(Include(Seq('a', 'm')), 'c')

That is sort of building the following set of strings.

ac bc cc . . .

When you use Exclude, it would be like you are picking a char that is not belonging to the sequence, like in:

Pattern(Exclude(Seq('0, 9')), c)

then you would end up with a set like:

ac bc cc . . .

It means, a set whose first character of the elements arent digits.

Seq is odd, to me Seq('a', 'm') says it matches 'am'. Why not overload X to support filtered forms instead? E.g X() is ".", X(from_, to_) is $from-$to, X(items) is [$items] and X(exclude) is [^$items]?

hmm, I think it is good, maybe p0 = X('a', 'z').

I like it.

Plus then you get to more add convenient overloads e.g. (X('a') | X('z')), (~X('q')), X[1:7] (I guess slices would be ranges, and indexes would be explicit numbers of repetitions), etc…

I think so i would ask you to open issues in crocs at github, so i can better keep track of suggestions and implement them.

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