I have only had Pituophis regurge, but it was obviously my fault. Too big of a food item and not enough heat. Rat literally rotted before the snake could digest. Given access to more heat, I am sure the pine would not have regurged. Live and learn.
I opened up a freshly killed fox snake in SW Wisconsin many years ago. That opportunistic snake had 12 field mice and two nestling birds in its gut. The exposed bluffs along the Miss River in SW Wisconsin provide plenty of heat to digest huge meals.
My opinion is that in captive situation if you offer enough heat (and enough of a cool area) you will not get regurges unless the snake is ill.

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