Help with Regex - Regular Expression adding leading zero to MAC address

[SpaceMonkey]

I'm monitoring a UPS with zabbix via SNMP. And when I read the MAC address i get it like 0:3:xx:xx:xx:xx i want it like 00:03:xx:xx:xx:xx. I tried it with regex formula in Regular expression with Preproscesing but I can't get it to work. My formula:

/\b[0-9,a-f]\b/g

works on regex101.com but not on zabbix, also I can't use the /g flag. I can't also use 0$0 because zabbix just writes 0$0 instead of 00:03:xx:xx:xx:xx

[Mike2K]

Why so difficult ? Just match the entire value, assuming your check is correct:

/(.*)

And then do 0$0

https://regex101.com/r/S1smmo/1

[SpaceMonkey]

That adds a zero at the beginning but I want to add 0 at all places where there is single digit, see in my example 0:3:xx --> 00:03:xx

[Mike2K]

Ahh, I didn't see that, sorry for that.

I'm not sure if preprocessing allows this form of iteration. What you could do is create a separate preprocessing rule for each block of the MAC address.
That won't be an elegant solution but if it works...

[SpaceMonkey]

No problem and thank you for the idea. But that is also a part of the problem that 0$0 doesn't work as regex but like plain text. So instead of writing the MAC address it writes 0$0 in plain text on latest data tab.

[Mike2K]

Wasn't it something like a \0 for all matches and \1, \2 for individual matches ?

Some reading: http://www.schatenseite.de/en/2018/0...r-expressions/

[SpaceMonkey]

Yes \0 also works but zabbix doesn't support global (/g) flag so \0 is the same as \1 in this example because is finds 1st matching and not all. So I would still have to do it for each block.

[Semiadmin]

For example:

[SpaceMonkey]

Thanks, it works. It's just what I was looking for.

[SpaceMonkey]

Thank you Mike2K and Semiadmin for help.