f (R U R2 U’) (R’ U R U’) f’ (horizontal center line & colored URB)
F (U R U2′ R’) (U’ R U R’) F’ (horizontal center line & colored UFL)
For the first one, R U R2 move is a little tricky. I put my thumb on D-face during f move. Normal R U. And here comes R2. I put my index finger on UBR piece and move it to DFR by only that finger. After this, my thumb is over U-face, not B-face.
That makes the following moves easy without regrip.
Exciting Rubik’s cube 