in reply to qq? with regards to Regexp::Grammars

That looks like a normal regexp fragment, matching a mandatory literal 'q' followed by an optional literal 'q' as part of attempting to match a perlish construct such as q{single-quoted string} or qq{double-quoted $string}.

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Re^2: qq? with regards to Regexp::Grammars
by Anonymous Monk on Jul 04, 2022 at 21:26 UTC

    You're so very right --- I thought it was one of Conway's cryptic "notations" that I wasn't able to find!

    <Thanks

[reply]
      Pointing this out might also help. 
        <token: delim>  [[:punct:]]++

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