It seems to me that the RE engine, prefering earlier matches, would take the ^ every time. I'm surprised that it doesn't do that in 5.005.
Of course, pos (which controls where \G matches) isn't explicitly documented as defaulting to 0. So I suppose it's a matter of which undocumented behaviour you want to rely on. ;-)
Perhaps a documentation update is in order?
Update: I stand corrected. :-) tilly tells me that /g matches are never supposed to start before the old match left off. Of course that makes sense. Not sure why I didn't realize that before. :-P
bbfu
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We can be like they are.
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