Thanks for your answers, finally I do something like : 

    nb, exclus = 0, []
    k, n, A,B  = Wild('k',exclude = [0]), Wild('n',exclude =  
set([0,1])),Wild('A', exclude = exclus), Wild('B')
    T = (A+k*x**n+B).matches(AvantS)
    while T != None and nb < 100 :
        # Traitement
        if diff(ApresS,var)== 
diff(T[A],var)+(T[k]*S('x')**T[n])+diff(T[A],var) :
            print 'A2:'+str(T[k])+":"+str(T[n])
        # Recherche du suivant
        exclus.append(T[A])
        A = Wild('A', exclude = exclus)
        T = (A+k*x**n+B).matches(AvantS)
        nb = nb + 1

And it works for me

Vincent

Le mardi 11 février 2014 22:40:27 UTC+1, Vincent MAILLE a écrit :
>
> Hi, is it possible to find all possible matches : 
>
> exp = S('3*x**2+2*x**3')
> k, n, A,B  = Wild('k',exclude = [0]), Wild('n',exclude =  
> set([0,1])),Wild('A'), Wild('B')
> T = (A+k*x**n+B).matches(exp)
>
> returns 
>
> {k_: 2, n_: 3, A_: 0, B_: 3*x**2}
>
> But can I have : 
> [{k_: 2, n_: 3, A_: 0, B_: 3*x**2}, {k_: 3, n_: 2, A_: 2*x**3, B_: 0}]
>
> Thanks
>
> Vincent
>
>

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