Discord large text generator

inputString = 'test string 0123456789'
discordLargeText = ''

for i=1,#inputString do
  currChar = inputString:sub(i,i):lower()

  if currChar:match('%a') then
    discordLargeText = discordLargeText .. ':regional_indicator_' .. currChar .. ': '

  elseif currChar:match('%s') then
    discordLargeText = discordLargeText .. ':white_large_square: '

  elseif currChar:match('%d') then
    local numbers = {'zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'}
    discordLargeText = discordLargeText .. ':' .. numbers[currChar + 1] .. ': '
  end
end

print(discordLargeText)