如何在Lua中将ISO 8601持续时间转换为格式化字符串？

function convertISO8601(duration)
    local years, months, weeks, days, hours, minutes, seconds = duration:match('P(%d+Y)?(%d+M)?(%d+W)?(%d+D)?T?(%d+H)?(%d+M)?(%d+S)?')
    
    local formattedDuration = ""
    
    if years then
        formattedDuration = formattedDuration .. years .. "年"
    end
    
    if months then
        formattedDuration = formattedDuration .. months .. "月"
    end
    
    if weeks then
        formattedDuration = formattedDuration .. weeks .. "周"
    end
    
    if days then
        formattedDuration = formattedDuration .. days .. "天"
    end
    
    if hours then
        formattedDuration = formattedDuration .. hours .. "小时"
    end
    
    if minutes then
        formattedDuration = formattedDuration .. minutes .. "分钟"
    end
    
    if seconds then
        formattedDuration = formattedDuration .. seconds .. "秒"
    end
    
    return formattedDuration
end

local duration = "P1Y2M3DT4H5M6S"
local formattedDuration = convertISO8601(duration)
print(formattedDuration)