AEM 6.1. Referrer Filter - Regexp not working

[#1]

HI everyone,

AEM 6.1.   

I get a 403 Forbidden, on a Post action, because the referrer host is not allowed. My referrer host is:  subdomain.domain.com

So I added in the config :

    org.apache.sling.security.impl.ReferrerFilter.config

    allow.hosts.regexp=[".*"]

This works as it should, but it leaves it quiet open and I try to narrow it down. But every single regex is not working:

    allow.hosts.regexp=[".*\.domain\.com"]

    allow.hosts.regexp=[".*.domain.com"]

    allow.hosts.regexp=["(.*)\.domain\.com"]

Is this a bug or do I use the wrong regex flavor? How can I narrow it down to  *.domain.com?

Kind regards,

Jerry

[smacdonald2008]

See The Sling Referrer Filter topic in this AEM Doc topic: 

https://docs.adobe.com/content/docs/en/aem/6-1/administer/security/security-checklist.html

[AhmedAtWork]

When adding the config via OSGI configuration console (manually), add it as

If you save that you'll notice it will be saved as

Which is the correct string for java's Paterrn#compile

Basically, if you are adding config via config files, as you should, you should add it as: