How do I set a selection of non-contiguous text in the latest version of iTerm2 and Chrome in OS X 10.8.3?
The majority of applications – iTerm2 and Google Chrome included – don't support this function. You cannot select non-contiguous text here.
In fact, this only works in apps like TextEdit or Pages, but not even in other OS X native apps such as Safari. Non-contiguous selection isn't even a feature of the most basic
NSTextField, because you can only set one range for selection here. For non-continuous selection you'd use
NSTextView, but then again applications don't use this to render text (like a browser or terminal does) – you'd use it to edit text.
In short: Not possible unless the developers implement this.
Firefox supports non-contiguous text selection. Simply hold ⌘ while selecting multiple text regions with the mouse.