The documentation contains examples for the proper syntax for a request filter
but the syntax is wrong. The doco says the filter uses the regex library but the
example does not use regex syntax.

Here is what the example is:

<Valve className="org.apache.catalina.valves.RemoteHostValve"
         allow="*.mycompany.com,www.yourcompany.com"/>
<Valve className="org.apache.catalina.valves.RemoteAddrValve"
         deny="192.168.1.*"/>

Should be:

<Valve className="org.apache.catalina.valves.RemoteHostValve"
         allow=".*mycompany\.com,www\.yourcompany\.com"/>
  <Valve className="org.apache.catalina.valves.RemoteAddrValve"
         deny="192\.168\.1\..*"/>

Thanks,
Steve