> There is no other interface into the number of accessible match
> strings (which might be nil) rather than
> (/ (length (match-data t)) 2).
That's still pretty inefficient -- I suggest that we introduce a new
function `match-count' to return that number.
Is there sufficient use for this function to justify introducing it?
I think that most cases where this would be used, the code would
then proceed to call match-data.
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