On Monday, June 23, 2014 5:02:27 PM UTC+2, F. B. wrote: 
>
> I mean, you can use the "alternatives" to match more patterns at the same 
> time. Something like:
>
> x_**n_ | x_
>
> which would match both Symbol("x") and Pow(x, n). 
>

This is also an example in which default values could be useful. In case x_ 
is matched, n_ should be defaulted to 1. 

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