Rational libertarians do not oppose all regulations.

Libertarians just believe that government regulation is not always the best way to achieve any given policy goal. In some cases, it is probably the only way. But in other cases, it is not only not the only way, it is often the most expensive and least efficient way to achieve the policy goal.

One ought to keep one's eye on the policy goal itself. Regulating the private market, of and in itself, just for the sake of regulating the private market, is not a viable or acceptable policy goal.

Perhaps it would be helpful if you recognized a distinction between "Libertarian Party" libertarians (fanatical rightwingers who argue from anti-socialist ideology) and regular libertarians (who make rational arguments based on the principle of liberalism). There is a big difference. I am certainly, and 'redwards' probably as well, are of the latter school of thought (aka 'leftwing libertarians').