'suffix' in regex matches empty string on all the data files, except

'suffix' in regex matches empty string on all the data files, except
one (incorrect) line containing port:
0.0.0.0 telemetry.appex.bing.net:443
The resulting entry in hosts file generated like this:
0.0.0.0 telemetry.appex.bing.net :443
which is incorrect. The bug was not spotted only because the incorrect
line in the data source was after the correct line without port,
thus it was ignored and not added to resulting hosts file.