parses an Amazon S3 URL and returns bucket, region and key

parseS3URL.js

function parseS3URL(url) {
  const tokens = /^https:\/\/([\w\d-]+)\.s3(-(\w\w-\w+-\d))?\.amazonaws\.com\/(.*?)((#|%23).*)?$/.exec(
    url
  );
  if (!tokens) {
    return false;
  }
  const [, bucket, , region = 'us-east-1', key] = tokens;
  return { bucket, region, key };
}