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Re: Pattern matching in functions

This does what you want:

"Maximilian Ulbrich" <mulbrich at> wrote in message 
news:cv6sop$6pj$1 at
> Hi,
> I would like to find subexpressions using Cases.
> In the following case, I expected to find a[b] and a[c] and therefore
> get {b,c} as the result. However, I get {l,l}.
> What happens and how can I solve this?
> Cases[l^4*a[b][l] + l*a[c][l], x_a[y_] -> y, {0, Infinity}]
> Thanks,
> Max

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