Hi Brad,
Close . . . but you can't do anything with that data. It allows you to select it all, but you can't copy it to a separate file. But very close. PSPad (windows only) has a list function that works just like the list in project. But then you can have that Listed data go to a separate file and then extract specific data out of that. The List function gives you the whole line, not just what you are looking for via regular expression.
You probably want to use the "Filter through command" (command-option-R) to get a new document produced: for something like hunting out the lines containing IP numbers use a simple
perl -ne 'print if /\d+.\d+.\d+.\d+/'
as the command, with "whole document" as source and "new document" as output will do the job(*). It's infinitely flexible if you're happy with regex and (some) underlying scripting language, and hence somewhat more in keeping with TextMate's guiding philosophy than a specific built-in function would be.
Cheers, Paul
(*) Yeah, I realise that's not a perfect fit to IP numbers, but it is usually good enough...