I've successfully set up check_mk 1.28 via OMD, which I know supports wildcards and regex for assignment of hosts/services to groups. I've tested the wildcards in the search box successfully, but the groups are not being populated and are showing up as "ineffective".
All searches I've seen so far say that this should be possible, but I can't determine what is missing. Ideas?
I had the same problems few days ago and in my case works in this way
~.\*omd.\*
. Tested on check_mk server 1.2.6p12