Regex in action is not working

[fbarcia-sirt]

Hi, I have some alerts with host field like this:
Alert 2028 - CAP Roses

And I'm trying to make an action to get only the 2028 value from host field to construct one browse action.

I've seen that the host is passed as a parameter like this: alerts/all/Alert%202028%20-%20CAP%20Roses
and the regex that I'm trying to use is the next: Alert (\d+) -
but it does not work, it sends me to alerts/all/Alert%202028%20-%20CAP%20Roses insted of alerts/all/2028

Any suggestion?

Thanks a lot!