generally yes, but here is an idea -- may be it would be worth defining
```
__custom_prefix_line =
```
and add it as an alternative within ```__prefix_line``` in common.conf and then override it here thus leaving ```failregex = ^%(__prefix_line)s \[Wa...```.  I think it might be of benefit if there are multiple failregex'es and they all would need the same prefix.... just an idea