Need to delete files that have a timestamp on its name

[ozwolverine]

Hello everybody,

I hava a cron that generates a backup with a name like:
backup_jboss-4.0.3_09102006.tar.gz, it gets generated once a week, every
friday, I need that after the cron creates the new weekly backup to delete
the others and I want just to leave in the system the last one, how could I
do that? How do the regular expression to delete the old backups should look
like?

thanks a lot.
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