regex character classes are great but \p{Decimal_Number} is probably the single least useful onehttps://twitter.com/mathias/status/758197376565833728 …
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What makes you say that, and what would be a better example?
there are very few reasons (if any) to use the obscure Unicode decimals, whereas "check if this is a sequence of letters,
regardless of language" is immensely useful. Or in context of programming languages, even more so are XID_{Start,Continue}.
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