regular expression matching.

[John A. Sullivan III]

On Fri, 2006-08-18 at 16:25 -0500, Marc Powell wrote:
> > -----Original Message-----
> > From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> > bounces at lists.sourceforge.net] On Behalf Of Christian Hedegaard
> > Sent: Friday, August 18, 2006 1:44 PM
> > To: nagios-users at lists.sourceforge.net
> > Subject: [Nagios-users] regular expression matching.
> > 
> > 
> > The Nagios documentation relating to the "regular expression" matching
> > seems very thin to me. And not quite clear.
> > 
> > It appears, by example, that the only regular expressions you can use
> > are "*" and "?", which I would just consider wildcard matching and not
> > regular expressions.
> > 
> > Regardless, can anything else be used as far as these "regular
> > expressions" are concerned?
> 
> You're probably looking for this option in nagios.cfg --
> 
> # "TRUE" REGULAR EXPRESSION MATCHING
> # This option controls whether or not "true" regular expression 
> # matching takes place in the object config files.  This option
> # only has an effect if regular expression matching is enabled
> # (see above).  If this option is DISABLED, regular expression
> # matching only occurs if a string contains wildcard characters
> # (* and ?).  If the option is ENABLED, regexp matching occurs
> # all the time (which can be annoying).
> # Values: 1 = enable true matching, 0 = disable true matching
> 
> use_true_regexp_matching=1
<snip>
Then again, maybe it isn't.  The title of this option is accurate but
easily misunderstood.  It isn't so much about changing how the
characters are interpreted, i.e., non-true uses "*" while true uses ".*"
but rather where regex interpretation takes place.  We leave it disabled
because we do not want all of our strings interpreted as regular
expressions.

Then again, maybe this is why we have found Nagios regex a little
inconsistent.  I wonder how it delimits a string.  I would view:

abc.*(?:def|ghi|jkl)

as a string but perhaps Nagios thinks the only regex is abc.*
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan at opensourcedevel.com

Financially sustainable open source development
http://www.opensourcedevel.com


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