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Question: How to extract an operator of a given form?

Question:How to extract an operator of a given form?

mmcdara 6578 Maple
piecewise type select relation
June 02 2021
2

Let expr defined this way

expr := piecewise(x(t)<0, -1, x(t)<1, 0, 1) + f(t) + piecewise(t<0, 0, t<1, 1, 0) + x(t)*piecewise(t<0, 1, t<1, 0, 1) + a*piecewise(t<0, 3, t<1, -1, 2)

How can I extract all the operators which contain a piecewise function of  t alone (the three bold operators in the expression above)?

TIA
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