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

<token: punctuation>  ( [-.,?!"';:\&()\[\]]+ )

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otherwise it is interpreted as defining a range rather than a literal hypen.

In reply to Re^2: Quantifier follows nothing error in Regexp::Grammars (quantifier "?") by hdb
in thread Quantifier follows nothing error in Regexp::Grammars by nathaniels

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