Your $strip command looks like a mess. Try typing /help $strip in mIRC for the correct usage. Also, you have too many brackets on it.

You are asking to do something very specific. There are many ways to accomplish what you want, but the best/easiest way depends on what exactly you are trying to accomplish.

It seems like you want text like (PRE) and (TV) removed, you can try /help $remove for an easier way to do this or try /help $regex for a more complicated and advanced way.