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Description of problem:

I have configured aide with the following rule:

/etc/.*\.conf$  CONTENT_EX

This should detect changes to any '.conf' file in any directory within '/etc'.
By changing the '/etc/audisp/plugins.d/syslog.conf' file, and then running 'aide', it says that no changes have been detected.
Using the '--verbose=255' option, and then checking the aide log file, seems to indicate that subdirectories are not being checked at all. There was no mention of the 'syslog.conf' file at all in the log.

Version-Release number of selected component (if applicable):

aide-0.15.1-11.el7.x86_64

How reproducible:

Everytime.

Steps to Reproduce:
1. Modify '/etc/aide.conf' with the above rule, then run 'aide -u'.
2. Modify '/etc/audisp/plugins.d/syslog.conf' (or any other '.conf' file in 
a subdirectory of '/etc').
3. Run 'aide' again.

Actual results:

AIDE, version 0.15.1

### All files match AIDE database. Looks okay!

Expected results:
Aide show indicate that the '.conf' file has been modified.

Additional info:

I used the same rule on a Fedora 25 PC, and it worked correctly. The version of aide on the PC was 0.16.

Found the same problem on an RHEL 6.8 server.
Set the severity to medium as this is security software and it is not doing what is expected according to the man page and manual.

Created attachment 1264559 [details]
Patch derived from upstream.

Upstream started to use PCRE regular expressions. Without this, it would be probably impossible (or at least quite difficult) to fix this functionality.

This Bugzilla has been reviewed by Red Hat and is not planned on being addressed in Red Hat Enterprise Linux 7 and therefore will be closed. If this bug is critical to production systems, please contact your Red Hat support representative and provide sufficient business justification.