I wish this was written earlier and I could have read it sooner:
Regurge or Vomit? | The Reptile Report
The snake I wrote about in this thread recently died of what my vet believes was a viral infection. This post discusses how a regurge is probably benign whereas a vomit may be a sign of illness, like in my rosy. Perhaps it's all semantics but this could have helpful for diagnosing my ill rosy earlier.