Two Corrections officers were attacked in a brutal four-hour span at Rikers Island Wednesday — including one guard who was slashed by an infamous subway knifer, union officials said.

The 11-year veteran officer was sliced at the island’s Otis Bantum Correctional Center around 9:30 a.m. by reputed Crips gang member Shemar Shaw, 24, who attacked shortly after complaining about a misplaced tablet, the officer said in an exclusive interview.

“He ran up behind me and I felt like he grabbed me from the back of my head and did, like a swipe motion across my face,” said the officer, who asked to remain anonymous.

“It felt like pain, and like sandpaper going across my face,” the officer said, noting that the weapon appeared to be a sharpened piece of metal.

Shaw is being held in Rikers after

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