Question: How to find if an expression has a given form?


How can I determine an expression is of the form a*b where a is anything but a function of t, and b a function of t?
I thought I could do this using patmatch but I can't make it work correctly.

For instance I would like patmatch (or something else) to return [a=C, f=F] when called this way patmatch(C*F(t), ?)

Thanks in advance

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