Per KEYCLOAK-3585:

Currently, valid redirect URI hostnames allow for wildcards at the end like so:

http://www.redhat.com/*

I'm managing several environments where clients need 'n' number of available redirect URI's with different hostnames, I.E.

http://developer1.env.redhat.com
http://developer2.env.redhat.com
http://developer3.env.redhat.com

Would really help to have the ability to wildcard hostnames too, I.E.:

http://*.env.redhat.com

I've submitted #3241 to address this issue, but there seem to be some concerns about allowing wildcards in other parts of the URL.  See the PR for a more fleshed out discussion, but wanted to start a thread here on the mailing list.  Particularly with respect to:
Josh Cain | Software Applications Engineer
Identity and Access Management
Red Hat
+1 256-452-0150