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Re: Pattern matching in functions


This does what you want:

Cases[l^4*a[b][l] + l*a[c][l],a[y_][_]->y, {0, Infinity}]

Steve Luttrell

"Maximilian Ulbrich" <mulbrich at berkeley.edu> wrote in message 
news:cv6sop$6pj$1 at smc.vnet.net...
> 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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