1*a89f2c85Sespiepatsubst(`string with a + to replace with a minus', `+', `minus')
2*a89f2c85Sespiepatsubst(`string with aaaaa to replace with a b', `a+', `b')
3*a89f2c85Sespiepatsubst(`+string with a starting + to replace with a minus', `^+', `minus')
4