Graphs

[Lawrence, Lynne]

<snip>
> > ... "output:offset:/-?([0-9.]+)/" "output:jitter:/jitter 
> ([0-9.]+) msec/"
> > 
> > As it is there ^^, this is what happens:
> > 
> >  +VALUE: 0.000492
> >  +VALUE: 0.157
> > 
> > So far, so fine... Now I change the regexp to read "Offset 
> -?([0-9.]+)", and
> > still it only pulls the number (a good thing for me, I only 
> want the number
> > - but that is not how I was understanding things.  The same 
> for the jitter
> > part, why does nagiostat only pull the numbers ?).
> >  
> > But now, ntp offset is not always positive, that is why I 
> added '-?', so, I
> > get a line that reads:
> > 
> > OUTPUT="NTP OK: Offset -0.000509 secs, jitter 0.157 msec, 
> peer is stratum 3"
> > 
> > And my regexp is ^^, the output:
> > 
> >  +VALUE: 0.000509
> >  +VALUE: 0.157
> > 
> > What happened to '-' ?  I want to insert a negative value 
> into RRD, so this
> > is wrong for me.
> > 
> 
> Parentheses create back-references. Include the minus (without the 
> question mark) inside the parentheses and it will be output 
> (I think. I 
> haven't tried the regex engine of nagiostat).

Actually, I believe you _do_ want to include the '?' in the parens,
otherwise positive values will not match.  Try:

   "output:offset:/(-?[0-9.]+)/"

to pick up either positive or negative values.

Regards,

Lynne Lawrence
QSS/USCG
<snip>
> 


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