It's pretty odd looking poop but poop nonetheless. If it was regurge 1) you'd know by the smell and 2) it would more than likely contain much more than just hair.

Usually the poop will consist of the hair because its the toughest part to break down and is of no use to the animal, so it's not abnormal to get hairy poo. (Never thought I'd say that before LOL). Heck, once I got a poop from a BP that actually had perfect whiskers on either side