Minor comment: the hyphen should be the first character in the character class:

Why do you think so, what are the reasons for this habit/style?

I vaguely recall maybe that I read this advice before, but it didn't stick :) (not memorable)

In reply to Re^3: Quantifier follows nothing error in Regexp::Grammars (hyphen charclass) by Anonymous Monk
in thread Quantifier follows nothing error in Regexp::Grammars by nathaniels

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