正则表达式将URL转换为两部分

const url = new URL('https://mybucketname.s3-eu-west-1.amazonaws.com/myfilename.zip')

const protocol = url.host.split('.')[1].split('-')[0]
const subdomain = url.host.split('.')[0]
const path = url.pathname
const result = protocol + '://' + subdomain + path

console.log(result)

const url = 'https://mybucketname.s3-eu-west-1.amazonaws.com/myfilename.zip'

const match = url.match(/https:\/\/(.+)\.([a-z][0-9]).+\.amazonaws\.com\/(.+)/)


const result = match[2] + '://' + match[1] + '/' + match[3]

console.log(result)