py3.12: Fix SyntaxWarnings for strings with back slashes

boto/__init__.py

@@ -1102,7 +1102,7 @@ def connect_machinelearning(aws_access_key_id=None,
 def storage_uri(uri_str, default_scheme='file', debug=0, validate=True,
                 bucket_storage_uri_class=BucketStorageUri,
                 suppress_consec_slashes=True, is_latest=False):
-    """
+    r"""
     Instantiate a StorageUri from a URI string.
 
     :type uri_str: string

boto/connection.py

@@ -668,10 +668,10 @@ def handle_proxy(self, proxy, proxy_port, proxy_user, proxy_pass):
         self.proxy_pass = proxy_pass
         if 'http_proxy' in os.environ and not self.proxy:
             pattern = re.compile(
-                '(?:http://)?'
-                '(?:(?P<user>[\w\-\.]+):(?P<pass>.*)@)?'
-                '(?P<host>[\w\-\.]+)'
-                '(?::(?P<port>\d+))?'
+                r'(?:http://)?'
+                r'(?:(?P<user>[\w\-\.]+):(?P<pass>.*)@)?'
+                r'(?P<host>[\w\-\.]+)'
+                r'(?::(?P<port>\d+))?'
             )
             match = pattern.match(os.environ['http_proxy'])
             if match:

boto/https_connection.py

@@ -77,7 +77,7 @@ def ValidateCertificateHostname(cert, hostname):
         "validating server certificate: hostname=%s, certificate hosts=%s",
         hostname, hosts)
     for host in hosts:
-        host_re = host.replace('.', '\.').replace('*', '[^.]*')
+        host_re = host.replace('.', r'\.').replace('*', '[^.]*')
         if re.search('^%s$' % (host_re,), hostname, re.I):
             return True
     return False

boto/pyami/config.py

@@ -95,7 +95,7 @@ def load_credential_file(self, path):
     def load_from_path(self, path):
         file = open(path)
         for line in file.readlines():
-            match = re.match("^#import[\s\t]*([^\s^\t]*)[\s\t]*$", line)
+            match = re.match(r"^#import[\s\t]*([^\s^\t]*)[\s\t]*$", line)
             if match:
                 extended_file = match.group(1)
                 (dir, file) = os.path.split(path)