[hobbit] Hobbit regular expression problem in macros

[Charles Jones]

Has anyone been able to confirm or reproduce this?

-Charles

Charles Jones wrote:
> I am again being bitten by regex problems.  I am able to reproduce it 
> with the following entries in hobbit-alerts.cfg:
>
> $IGNORE_HOSTS=%prod-web-(1|2|3|4|9|10|11)$
> HOST=$IGNORE_HOSTS service=*
> IGNORE
>
> If I then check the "info" column of a host that is *not* supposed to 
> be ignored, such as prod-web-12. It shows that it is indeed ignored. 
> This is a serious problem as I have already missed alerts for some 
> production hosts because of this problem.
>
> According to pcretest (Henriks recommended method of testing a Hobbit 
> regex), there is nothing wrong with the regular expression that I am 
> using:
> $ pcretest
> PCRE version 6.6 06-Feb-2006
> re> /prod-web-(1|2|3|4|9|10|11)$/
> data> prod-web-12    (*correctly not matching*)
> No match
> data> prod-web-19  (*correctly not matching*)
> No match
> data> prod-web-10 (*correctly matching*)
>  0: prod-web-10
>  1: 10
>
> From the above tests you can see that prod-web-12 does not match the 
> regex when using pcretest, yet Hobbit is matching it for some reason. 
> A possible work-around could be to not use a regex at all, such as 
> $IGNORE_HOSTS=prod-web-1,prod-web-2,prod-web-3... but that is not 
> really a solution if you have hundreds of hosts, and my main point is 
> that regular expressions are not working as they are documented.
>
> I've also tried other undocumented ways of using the regex, including:
>
> No hosts matched at all
> $IGNORE_HOSTS=%prod-web-(1|2|3|4|9|10|11)$
> HOST="IGNORE_HOSTS"
>
> No hosts matched at all
> $IGNORE_HOSTS="%prod-web-(1|2|3|4|9|10|11)$"
> HOST=$IGNORE_HOSTS
>
> All hosts match (both web-12 and web-11)
> $IGNORE_HOSTS=prod-web-(1|2|3|4|9|10|11)$
> HOST=%$IGNORE_HOSTS
>
> If anyone else can verify or reproduce this, it would be helpful in at 
> least convincing Henrik to add it to the list of things to fix in the 
> next version. I honestly hope that it's not a problem with Hobbit and 
> instead something I am doing wrong - if so please enlighten me.
>
> -Charles

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