Hello!
I suggest you attempt using a regex that doesn't just check if the word "directories" is in the output, but that also checks that:
a) It's a <directories> entry
b) containes realtime="yes"
c) It targets /var/ossec/etc/ossec.conf
I have come up with this regex here that seems to do the trick: "<directories[^>]*realtime=\"yes\"[^>]*>\/var\/ossec\/etc\/ossec.conf<\/directories>".
I have tested it using this online tool:
https://regex101.com/You can try feeding it strings such as "<directories realtime="yes">/var/ossec/etc/ossec.conf</directories>" to make sure that the above conditions are met and only then the result should be "Passed"