Not sure if it is quite what you are after, but I have allowed the user to modify the name regex and steamid message before adding it to the file. At least with the SteamID that means you can add a note or identifier (by default is the account name) that will show up in the file, however this does not apply so much for the regex. If this isn't quite what you are after then open another issue and I will consider if it is something I would like to add.
Not sure if it is quite what you are after, but I have allowed the user to modify the name regex and steamid message before adding it to the file. At least with the SteamID that means you can add a note or identifier (by default is the account name) that will show up in the file, however this does not apply so much for the regex. If this isn't quite what you are after then open another issue and I will consider if it is something I would like to add.