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Knowing how to wield regular expressions unleashes processing powers you might not even know were available.

What does it mean?

  • to me, it is "you might not even know the fact that processing powers were available."

  • but, it is like "the processing powers (which you might not even know) were available"

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You are correct, it means the first of those two interpretations. We can exclude the second interpretation by substituting "unknown" for "which you might not even know". That would leave

Knowing how to wield regular expressions unleashes unknown processing powers were available.

That is clearly not grammatical, because "were available" has to connect to "know" in the relative clause. So, it's not the powers that were unknown, but the availability.

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  • Can you explain more on relative clause? Is it “Knowing how to wield regular expressions unleashes processing powers you might not even know (which) were available"?
    – wtdark
    May 27 '20 at 1:57
  • The original has a reduced form of "Knowing how to wield regular expressions,unleashes powers [which] you might not even know were available." Omitting the relative pronoun "which" makes it a reduced clause, but doesn't change the meaning. You migtht like to check out thoughtco.com/relative-clause-grammar-1692042 and numerous other references on the net. May 27 '20 at 2:30

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