http://members.home.net/gravitypages/regexp.html
This *site* is really geared toward a competing newsreader, MicroPlanet Gravity,
but the REGEX page is good.
I cannot verify that NewsBin's REGEX engine works exactly the same as Microplanet Gravity's REGEX engine.
If you want to know more about REGEX, look here.
I am not going to say that I do not use Gravity.
I like it.
It has a good posting feature (something that is lacking in NewsBin -
but I don't use NewsBin to post anything other than requests or replies!!)
Also, for the pic DL'ers here, Gravity's Image Gallery is good.
More on this later, Quade.
I am not sure of the latest Gravity release, but NewsBin's DLing is FASTER than Gravity's.