cleanup: fixes regex escape warnings in S3Uri.py, FileLists.py

[jessie-murray]

Hi,

Similar to the regex escaping issues reported in #1351, it looks like there are still a few invalid escape sequences in S3Uri.py and FileLists.py in s3cmd version 2.4.0.

I saw these warnings while uploading a file:

/usr/local/Cellar/s3cmd/2.4.0_1/libexec/lib/python3.12/site-packages/S3/S3Uri.py:122: SyntaxWarning: invalid escape sequence '\.'
  m = re.match("(.*\.)?s3(?:\-[^\.]*)?(?:\.dualstack)?(?:\.[^\.]*)?\.amazonaws\.com(?:\.cn)?$",
/usr/local/Cellar/s3cmd/2.4.0_1/libexec/lib/python3.12/site-packages/S3/S3Uri.py:173: SyntaxWarning: invalid escape sequence '\w'
  _re = re.compile("^(\w+://)?(.*)", re.UNICODE)
/usr/local/Cellar/s3cmd/2.4.0_1/libexec/lib/python3.12/site-packages/S3/FileLists.py:525: SyntaxWarning: invalid escape sequence '\*'
  wildcard_split_result = re.split("\*|\?", uri_str, maxsplit=1)

The first is from this line:

s3cmd/S3/S3Uri.py

Lines 122 to 123 in dbdee8f

	m = re.match("(.*\.)?s3(?:\-[^\.]*)?(?:\.dualstack)?(?:\.[^\.]*)?\.amazonaws\.com(?:\.cn)?$",
	hostname, re.IGNORECASE | re.UNICODE)

The \ characters are interpreted as escaping characters in the Python string itself.

The second warning is about the same issue for a different line, where only one \ needs to be escaped or at least interpreted differently, the one in \w:

s3cmd/S3/S3Uri.py

Line 170 in dbdee8f

_re = re.compile("^(\w+://)?(.*)", re.UNICODE)

And the third one from here:

s3cmd/S3/FileLists.py

Line 525 in dbdee8f

wildcard_split_result = re.split("\*|\?", uri_str, maxsplit=1)

There are many different ways to fix this problem, but I saw that commit 7ebafbe was linked from #1351 so I used the same technique here, I hope this works for you.

[lavigne958]

looks good to me, I tried it and it works (for the URI match where the bucket website name is extracted.