Good question, Seraph, I was thinking the same thing...
bigdhilltopper, you need to separate them. Permanently. Get a separate enclosure/set-up, and move one of the snakes into it. It's VERY possible (in fact, I would go so far as to say "likely") that the stress from being in the same tank as another snake is what is causing the one to regurge.
Snakes are NOT social creatures. They don't seek each other out in the wild except for breeding. They do not enjoy each others' company... For that matter, they're such solitary creatures that being around other snakes stresses them out. Sometimes, that stress can be enough to cause extreme health issues--as in your case, with the regurges. Please do a search here for "cohabitation" to see some previous discussions on the subject.
In the mean time, please separate your snakes and follow strict regurge protocol for the one with the issues.