Replacement rules for powers of a symbol – mathematica.stackexchange.com

Suppose, I have an expression like so: In[68]:= expr = 2 + 5*q + q^2 + 8 q^3 + 19 q^7 Out[68]= 2 + 5 q + q^2 + 8 q^3 + 19 q^7 Now I want to take all powers of q lying between 0 and 2 to zero i.e. ...

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