FEN inverter website/page? This board shows the black pieces on the bottom, but the white pieces are supposed to be there; I accidentally set up the board so that white's pieces are on the black side. I am looking to flip the board with the following FEN:

# R2K1B1R/PPP2QPP/5N1N/1n2q3/8/1p3n2/pbpp3p/1kr4r w KQkq - 0 1


Board:

R2K1B1R/PPP2QPP/5N1N/1n2q3/8/1p3n2/pbpp3p/1kr4r w KQkq - 0 1


How may I accomplish this without re-setting the pieces manually? I tried switching the rows, but I got:

# 1kr4r/pbpp3p/1p3n2/8/1n2q3/5N1N/PPP2QPP/R2K1B1R w KQkq - 0 1


Board:

1kr4r/pbpp3p/1p3n2/8/1n2q3/5N1N/PPP2QPP/R2K1B1R w KQkq - 0 1
Although one may try to place the first row as the eighth, the second row as the seventh, etc., the board will appear flipped (as shown above).

This is a horizontal flip (mirror-image over the x-axis) and does not look quite right. Switching the letters from lower-case to capital and vice-versa would switch the colors, but that's not the best solution. 

Upon closer examination, a vertical flip (or mirror over the y-axis) of this horizontal flip would solve the problem: Reverse each sub-string delimited by a slash until you hit the second field, then leave it as is.

The final product is the same FEN, except the first field is a reverse string of itself.

# r4rk1/p3ppbp/2n3p1/8/3q2n1/N1N5/PPQ2PPP/R1B1K2R w KQkq - 0 1


Board:

r4rk1/p3ppbp/2n3p1/8/3q2n1/N1N5/PPQ2PPP/R1B1K2R w KQkq - 0 1