It’s an explicit goal of this proposal to figure out how set notation interacts with properties of strings.
Here’s the high-level syntax again:
// difference/subtraction
[A--B]
// intersection
[A&&B]
// nested character class
[A--[0-9]]
You can imagine A and B being properties of strings. In that case, we‘d get e.g.
// match all multi-code point emoji sequences:
\p{RGI_Emoji}--\p{Emoji}
@msaboff mentioned he’d prefer different syntax depending on how the two proposals interact. Michael, could you elaborate?
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