Unix jockeys use them all the time. What? You NT guys aren't using Regular Expressions? They are extremely powerful and often elegant way to get a lot done in a hurry.
Check out http://www.textpad.com for a great Win32 editor that supports using regular expressions. There may be others. Check out the Rx Cookbook for great examples of usable expressions to apply to your text. http://aspn.activestate.com/ASPN/Cookbook/Rx