Improve S3 buckets detection

[Regala]

Hey,

I have the current test file, attached.
index_nosecrets.txt

flaws.cloud.s3.amazonaws.com indicates that this might be a bucket, but doing
aws s3 ls s3://flaws.cloud.s3.amazonaws.com returns no such bucket.

However, doing:
aws s3 ls s3://flaws.cloud successfully connects to it:
2017-03-14 03:00:38 2575 hint1.html 2017-03-03 04:05:17 1707 hint2.html 2017-03-03 04:05:11 1101 hint3.html 2018-07-10 17:47:16 3082 index.html 2018-07-10 17:47:16 15979 logo.png 2017-02-27 01:59:28 46 robots.txt 2017-02-27 01:59:30 1051 secret-dd02c7c.html

My suggestion is to improve this detection, by e.g. making use of Patrick's regex's:
{bucketname}.s3.amazonaws.com
^[a-z0-9\.\-]{0,63}\.?s3.amazonaws\.com$

{bucketname}.s3-website(.|-){region}.amazonaws.com (+ possible China region)
^[a-z0-9.-]{3,63}.s3-website.--\w{2,14}-\d{1,2}.amazonaws.com(.cn)?$

{bucketname}.s3(.|-){region}.amazonaws.com
^[a-z0-9.-]{3,63}.s3.--\w{2,14}-\d{1,2}.amazonaws.com$

{bucketname}.s3.dualstack.{region}.amazonaws.com
^[a-z0-9.-]{3,63}.s3.dualstack.(eu|ap|us|ca|sa)-\w{2,14}-\d{1,2}.amazonaws.com$`

Cheers