webpack中webpack.config.js中 less的配置方式两种方式的不同?

Question

{
test:/\.less$/,
loader:"style-loader!css-loader!less-loader",
}
1上面是loader下面是use他们的区别是啥呢
test里面也不一样/.(less|css)$/,和/\.less$/,
{
test:/\.(less|css)$/,
use:['style-loader','css-loader','less-loader'],
}