How to specify file-include regex in synchronizer

[MrM40]

I've been trying to solve a simple problem, how to specify to only upload filefile1.dat I have these files in the folder: file1.dat file2.dat file3.dat

I've tried with many different regex'es for the parameter include_file_regexes but not succeed to include on this file.

from b2sdk.v2 import SyncPolicyManager
from b2sdk.v2 import parse_folder
from b2sdk.v2 import Synchronizer
from b2sdk.v2 import SyncReport
import time, sys

source = (r"c:\temp\test")
destination = "b2://" + AccountInfos["bucketName"]
source = parse_folder(source, b2api)
destination = parse_folder(destination, b2api)

policies_manager = ScanPoliciesManager(exclude_file_regexes=".", include_file_regexes=r"file1\.dat")
synchronizer = Synchronizer(max_workers=10, policies_manager=policies_manager, dry_run=True, allow_empty_source=True)
no_progress = False

with SyncReport(sys.stdout, no_progress) as reporter:
        synchronizer.sync_folders(
            source_folder=source,
            dest_folder=destination,
            now_millis=int(round(time.time() * 1000)),
            reporter=reporter,
        )