🐥 Validating an Amazon S3 bucket name using TypeScript and PHP

If you ever need to validate if a string can be used as an Amazon S3 bucket, you can do it with a regular expression.

TypeScript

const isValidS3BucketName = (bucketName: string): boolean => {
  if (!bucketName || bucketName === '') {
    return false;
  }

  const vatNumberRegex = new RegExp(
    /^(?!xn--|sthree-|amzn-s3-demo-|.*-s3alias$|.*--ol-s3$|.*--x-s3$)[a-z0-9][a-z0-9-]{1,61}[a-z0-9]$/,
  );
  return vatNumberRegex.test(bucketName);
};

PHP

function isValidS3BucketName(string $bucketName): bool {
    if (empty($bucketName)) {
        return false;
    }

    $vatNumberRegex = '^(?!xn--|sthree-|amzn-s3-demo-|.*-s3alias$|.*--ol-s3$|.*--x-s3$)[a-z0-9][a-z0-9-]{1,61}[a-z0-9]$/';
    return preg_match($vatNumberRegex, $bucketName) === 1;
}

The rules for the names can be found here.