9] in .NET regular expressions

This question already has an answer here:

d is less efficient than [0-9] 6 answers

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I think the answer is also in the linked reference:

d matches any decimal digit. It is equivalent to the p{Nd} regular expression pattern, which includes the standard decimal digits 0-9 as well as the decimal digits of a number of other character sets .

So d can match things like decimal digits in the Arabic character set, which wouldn't be matched with [0-9] .

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