A Java programme that converts between Discord regional indicator characters and text.
Discord has emoji whose symbols are:
:regional_indicator_x:
:flag_xx:
:united_nations:
:regional_indicator_x::regional_indicator_y: becomes :flag_xy:, unless :flag_xy: does not exist, in which case
it becomes two boxed letters.
One notable exception is :regional_indicator_u::regional_indicator_n:, which becomes :united_nations:.
My flag-text programme converts between standard letters and regional indicator emoji.