No oml sorry im tired of explaining.You said you could use two colors and only 3 characters per color, so if my username was more than 6 characters, I would have the default color in there as well.
Ex.
cRiNgElOrD_
See, that's more than one color.
Above said thing
Dad&6dab&9day
Would not be allowed and default is a is identified as a color. Only 2 colors would be used not 3.
This can be done by words being broken into 2 sections and the breaks are A if there is no &(num) infront then adding any other &