Windows text editor that shows/hides lines based on RegEx or Grep syntax?

Question

One of my application components produces some extremely hairy log files. They require a lot of poking and prodding before they produce useful information. I'm on the hunt for a text editor for windows that will let me enter text in either RegEx or Grep-style syntax, and automatically show/hide the relevant lines.

Does anyone know of a text editor that has this feature?

Thanks!
IVR Avenger

Answer 1

I know it's answered already, but http://glogg.bonnefon.org/ is the perfect answer for this. Couldn't live w/o it.