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Pattern matching partial derivatives


Hi all,
I can't get finding patterns that would match a simple partial derivative:

Input:
  ?f
  ?x
  D[f, x, NonConstants -> {f}] // FullForm

Output:
  Global`f
  Global`x
  D[f, x, Rule[NonConstants, List[f]]]

Input:
  MatchQ[
    D[f, x, Rule[NonConstants, List[f]]],
    D[f_, x_, Rule[NonConstants, nc_]]
  ]
Output:
  False


Am I damned ?
Many thanks in advance !
Cheers,
Nicolas


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