### 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 [2*I*x], [I*x], [I], and [2*I]. 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
print(f.find(I*w0))
print(g.find(I*w0))
print(h.find(I*w0))
print(k.find(I*w0))
```