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Question: Finding all derivatives of a certain order in an expression

Question:Finding all derivatives of a certain order in an expression

subzero 30 Maple
derivative
April 03 2021
1

I have a long expression stored in a variable. The expression contains different orders of the derivative of a function u(x,y,z). Is it possible to find all the derivatives of u appearing in the expression? For example, if my expression is 3 uxx - 3 uxy + 4 x u - 7 x uz + u uxx, then I would like to get {uxx, uxy} if I specify order 2 and {uz} if order 1.
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