Regex in customs actions

[nagios_aws]

Hello,

I want to use Regex in the "match criteria" for services, here is my Regex and example of service name :

Regex :

Code: Select all

^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\](.*(lmgrd))$

Servicename :

Code: Select all

[thing] [stuff] [26009] [tech] SIMULIA Isight v2017 VAd lmgrd

this Regex match everything, but I need to reverse the "lmgrd" part
I want to match lines with "tech" present and "lmgrd" NOT present at the end

I miss the negative lookahead in the Regex, but I don't know where to put it ...

Thanks for your help

[mcapra]

You could try a negative lookbehind:

Code: Select all

^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\].*(?<!lmgrd)$

https://regex101.com/r/XJNHGf/2
https://regex101.com/r/XJNHGf/3

[nagios_aws]

Hello,

this works on Regex101, but when I put it in Nagios "match criteria" buttons doesn't appears in services, are you sure PHP preg_match() can handle those kinds of Regex

Is it possible to see what Nagios see when it tries this Regex ?

Thank you

[mcapra]

This appears to work fine for me in a preg_match:

Code: Select all

<?php
$re = '/^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\].*(?<!lmgrd)$/';
$str = '[thing] [stuff] [26009] [lmstat] SIMULIA Isight v2017 foo';
preg_match($re, $str, $matches);
var_dump($matches);
?>

[root@xi-stable tmp]# php test.php
array(4) {
  [0]=>
  string(57) "[thing] [stuff] [26009] [lmstat] SIMULIA Isight v2017 foo"
  [1]=>
  string(5) "stuff"
  [2]=>
  string(5) "26009"
  [3]=>
  string(6) "lmstat"
}

....

<?php
$re = '/^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\].*(?<!lmgrd)$/';
$str = '[thing] [stuff] [26009] [lmstat] SIMULIA Isight v2017 other stuff in between lmgrd';
preg_match($re, $str, $matches);
var_dump($matches);
?>

[root@xi-stable tmp]# php test.php
array(0) {
}

And this is pretty much what's happening on the back-end. Is your PHP code in the Actions component settings that evaluates $showlink working correctly without the regex? It's not commented out I hope?

[nagios_aws]

Hello,

thank you for your answer.
I have this in the "code" section :

Code: Select all

/*
if ((%objecttype% == 'host' && '%hoststateid%' != '0') || (%objecttype%=='service' && '%servicestateid%'!='0')) {
    $img = '/nagiosxi/images/schedulecheck.png';
    $showlink = true;
} else {
    $showlink = false;
}
*/

It's by default, I haven't touch anything in this and it worked with another regex.

when I get rid of the regex, the button is correctly displayed in every services

if i try this :

Code: Select all

^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\].*(lmgrd)$

so without negation, it doesn't even work, the button is not displayed.

[mcapra]

Would it be possible for you to PM me a system profile? I think that would expedite a proper answer.

From the Nagios XI GUI, you can gather a profile via Admin -> System Profile -> Download Profile.

[mcapra]

I got your profile and did some testing.

I have exactly this in the "Service" field:

Code: Select all

/^\[.*\]\s\[(.*)\]\s\[(.*)\]\s\[(lmstat)\].*(?<!lmgrd)$/

And that seems to be behaving exactly as expected:

2017_04_18_13_45_12_Service_Status_Detail_Nagios_XI.png

2017_04_18_13_44_39_Nagios_XI.png

With "Test Link" only being drawn in the non-lmgrd service. Is this the behavior you're trying to get?

Here's a screenshot of the settings i'm using:

2017_04_18_13_46_55_Administration_Nagios_XI.png

[nagios_aws]

Hello,

sorry for the delay, I set your regex and it works as expected, thank you !

I don't know why it wasn't working before ...

[cdienger]

Thanks for the update. Is it safe to assume this thread can be locked or did you have any additional related questions?