[Box Backup] Regular expression error

[AH SING Nicolas]

Hi,
when I specify the exclude directive ExcludeFilesRegex as in the 
example, an exception (1/31) is thrown

I declare my backup directory in my bbackupd.conf like this :

BackupLocations
{
        home-nicolas-sav
        {
                Path = /home/nicolas/sav
                ExcludeFilesRegex = *.(mp3|MP3)$
        }
}

Here is the content of my log file :
...
Nov 15 18:03:42 core bbackupd[18137]: Starting daemon (config: 
/home/nicolas/tmp/box/bbackupd.conf) (version 0.08)
Nov 15 18:03:42 core bbackupd[18137]: Beginning scan of local files
Nov 15 18:03:42 core bbackupd[18137]: Opening connection to server core...
Nov 15 18:03:42 core bbstored[17735]: Incoming connection from 
192.168.0.10 port 34583 (handling in child 18138)
Nov 15 18:03:42 core bbstored[18138]: Certificate CN: BACKUP-42
Nov 15 18:03:42 core bbackupd[18137]: Send Version(0x1)
Nov 15 18:03:42 core bbackupd[18137]: Receive Version(0x1)
Nov 15 18:03:42 core bbackupd[18137]: Send Login(0x42,0x0)
Nov 15 18:03:42 core bbstored[18138]: Login: Client ID 00000042, Read/Write
Nov 15 18:03:42 core bbackupd[18137]: Receive 
LoginConfirmed(0x3e8eeb4e68a40,0x132,0x200000,0x233200)
Nov 15 18:03:42 core bbackupd[18137]: Connection made, login successful
Nov 15 18:03:42 core bbackupd[18137]: Send ListDirectory(0x1,0x2,0xc,false)
Nov 15 18:03:42 core bbackupd[18137]: Receive Success(0x1)
Nov 15 18:03:42 core bbackupd[18137]: Receiving stream, size 184
Nov 15 18:03:42 core bbackupd[18137]: Send 
SetClientStoreMarker(0x3e8ef05c8b780)
Nov 15 18:03:42 core bbackupd[18137]: Receive Success(0x3e8ef05c8b780)
Nov 15 18:03:42 core bbackupd[18137]: Send Finished()
Nov 15 18:03:42 core bbstored[18138]: Session finished
Nov 15 18:03:42 core bbackupd[18137]: Receive Finished()
Nov 15 18:03:42 core bbackupd[18137]: Exception caught (1/31), reset 
state and waiting to retry...

I launch the client deamon with non root user but I don't think it's 
because of this.
Does anybody have an idea of the reason of the error?

thanx