Describe the bug
The client.py _is_uri() method is throwing an exception when the track is a local file.

When the URI is something "normal", like "spotify:track:7hK9jnESeCfc5fIHH76jKh", the _is_uri() method recognizes it as valid via the regex match.

However, when the URI is for a local track, like "spotify:local:Toot+Sweet:Celtic+Christmas:Christmas+Medley:248", the _is_uri() regex match fails. It then calls _get_id("track", "spotify:local:Toot+Sweet:Celtic+Christmas:Christmas+Medley:248"), and none of the matches work in that function and it eventually throws an Unsupported URL SpotifyException (currently on line 2139).

Your code
I have a list of URIs that I've retrieved via client.playlist_items().

When I call the following function, passing that list of URIs, that's when the exception is thrown.

self.api.playlist_replace_items(playlist_id, uris[:100])

spotipy.exceptions.SpotifyException: http status: 400, code: -1 - Unsupported URL / URI., reason: None

Expected behavior
The function works without throwing an exception

Output
(self.api is an instance of the Spotify class)
(playlist is an object with an id attribute)

File "D:\Documents\Python\spotify-backup\spotify_api.py", line 94, in update_tracks
self.api.playlist_replace_items(playlist.id, uris[:chunk]) # Replace playlist's first 100 items (limit of Spotify)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python\Lib\site-packages\spotipy\client.py", line 1187, in playlist_replace_items
ftracks = [self._get_uri("track", tid) for tid in items]
~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "C:\Python\Lib\site-packages\spotipy\client.py", line 2145, in _get_uri
return "spotify:" + type + ":" + self._get_id(type, id)
~~~~~~~~~~~~^^^^^^^^^^
File "C:\Python\Lib\site-packages\spotipy\client.py", line 2139, in _get_id
raise SpotifyException(400, -1, "Unsupported URL / URI.")
spotipy.exceptions.SpotifyException: http status: 400, code: -1 - Unsupported URL / URI., reason: None

Environment:

• OS: Windows 11
• Python version: 3.14.0
• spotipy version: 2.25.2
• your IDE: PyCharm

Additional context
I believe the fix would be to modify the _regex_spotify_uri regex pattern to account for the local file syntax, although I'm not sure what the Spotify syntax spec for local files is.

It looks like it might be spotify:local:artist_name:album_name:track_name:number.
My local file is:
Artist: Toot Sweet
Album: Celtic Christmas
Title: Christmas Medley
Filename: "Christmas Medley.mp3"

and the Spotify URI for it is "spotify:local:Toot+Sweet:Celtic+Christmas:Christmas+Medley:248". I have no idea what the '248' indicates.

FYI, the type parameter being passed is "track".