fix: "invalid escape sequence" error in some regexp and strings.

[FomalhautWeisszwerg]

Fixed "invalid escape sequence" errors caused by missing 'r' modifiers or incomplete escaping in some strings.

Problem

Sometimes aws-cli stopped by errors like following

aws: error: argument --role-arn: expected one argument
/usr/local/lib/python3.12/site-packages/awscli/compat.py:463: SyntaxWarning: invalid escape sequence '\s'
  _distributor_id_file_re = re.compile("(?:DISTRIB_ID\s*=)\s*(.*)", re.I)
/usr/local/lib/python3.12/site-packages/awscli/compat.py:464: SyntaxWarning: invalid escape sequence '\s'
  _release_file_re = re.compile("(?:DISTRIB_RELEASE\s*=)\s*(.*)", re.I)
/usr/local/lib/python3.12/site-packages/awscli/compat.py:465: SyntaxWarning: invalid escape sequence '\s'
  _codename_file_re = re.compile("(?:DISTRIB_CODENAME\s*=)\s*(.*)", re.I)
/usr/local/lib/python3.12/site-packages/awscli/shorthand.py:132: SyntaxWarning: invalid escape sequence '\!'
  _START_WORD = u'\!\#-&\(-\+\--\<\>-Z\\\\-z\u007c-\uffff'
/usr/local/lib/python3.12/site-packages/awscli/shorthand.py:133: SyntaxWarning: invalid escape sequence '\s'
  _FIRST_FOLLOW_CHARS = u'\s\!\#-&\(-\+\--\\\\\^-\|~-\uffff'
/usr/local/lib/python3.12/site-packages/awscli/shorthand.py:134: SyntaxWarning: invalid escape sequence '\s'
  _SECOND_FOLLOW_CHARS = u'\s\!\#-&\(-\+\--\<\>-\uffff'
/usr/local/lib/python3.12/site-packages/awscli/customizations/cloudtrail/validation.py:76: SyntaxWarning: invalid escape sequence '\d'
  pattern = re.compile('arn:.+:cloudtrail:.+:\d{12}:trail/.+')
/usr/local/lib/python3.12/site-packages/awscli/customizations/codedeploy/push.py:65: SyntaxWarning: invalid escape sequence '\<'
  'uploading. Use the format s3://\<bucket\>/\<key\>'
/usr/local/lib/python3.12/site-packages/awscli/customizations/emr/createcluster.py:199: SyntaxWarning: invalid escape sequence '\d'
  is_valid_ami_version = re.match('\d?\..*', parsed_args.ami_version)
Unable to locate credentials. You can configure credentials by running "aws configure".

I saw the errors at aws-cli version 1.30.5 (commit 1a1e73c).

Cause of Errors

The errors caused by missing 'r' modifiers or incomplete escaping.

Description of changes

This pull request fixes missing 'r' modifiers and escaping in those strings.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Thanks for reviewing :-)

[begemotik]

Facing the same behavior

/app/.venv/lib/python3.12/site-packages/awscli/compat.py:463: SyntaxWarning: invalid escape sequence '\s'
  _distributor_id_file_re = re.compile("(?:DISTRIB_ID\s*=)\s*(.*)", re.I)
/app/.venv/lib/python3.12/site-packages/awscli/compat.py:464: SyntaxWarning: invalid escape sequence '\s'
  _release_file_re = re.compile("(?:DISTRIB_RELEASE\s*=)\s*(.*)", re.I)
...

Would appreciate reviewing it and merging