Host regex stopped working after upgrade

[carmackd]

I recently upgraded a forwarder from 4.0.9 to 4.1.4, and after I did so, the host_regex I had in place on 4.0.9 stopped working. Does anyone know why it would work with 4.0.9, and not 4.1.4? Here is the host regex attribute I'm using, and an example of the file path.

host_regex = ^\/\w+\/\w+\/\w+\/\w+\/(\w+)

/mount/u01/vault/win/hostname.xxxx.xxxx.com/hostname.xxxx.xxxx.com-syslog-info-2011-01-08

[ahall_splunk]

It would be helpful to post your full inputs.conf stanza, plus any props that are relevant to the input.