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How to find arbitrary complex constants in symbolic expressions?

How do I go about finding terms in a symbolic expression containing arbitrary complex constants? I had hoped that the code fragment below would yield something like [2Ix], [Ix], [I], and [2I]. However, instead it yields [], [I*x], [], and []. Is there another way to isolate the terms containing an arbitrary complex constant?

w0 = SR.wild(0)

f = x^2 + 2*I*x + 1
g = x^2 + I*x + 1
h = x^2 + 2*x + I
k = x^2 + x + 2*I