I'd argue that perl gets it right--as the default behavior, this behavior would gravely violate the principle of least surprise, but for the 0.01% of people who want \d to match ੧, there's no harm to making it available as an option you need to specifically request.
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You have to tell to interpret stdin as UTF-8 (flag -C) - then it works: https://news.ycombinator.com/item?id=5734641
Good to know, thanks.
I'd argue that perl gets it right--as the default behavior, this behavior would gravely violate the principle of least surprise, but for the 0.01% of people who want \d to match ੧, there's no harm to making it available as an option you need to specifically request.