topic Re: Regex for Hostname in Open Q&A

Regex for Hostname

bill_scheuernst — Wed, 24 Sep 2025 20:02:23 GMT

I've been working on updating our automatic tag rules for a current project and would like to use Regex to capture a device type from a dns name, i.e. ABCCORE01.TEST.COM. The ABC prefix is the location of the device, and CORE is the device type. I would like to only use the device type as an optional tag value, such as "Device Capability: <value>". I'm sure this is nothing new.

This worked in regex101, but not in DT...

^[a-zA-Z0-9]{0,3}([a-zA-Z]+?)\d

The location prefix can be ABC or AB1.

Re: Regex for Hostname

Mohamed_Hamdy — Thu, 25 Sep 2025 05:59:19 GMT

you can try this one, {Host:DetectedName/^AB[C0-9]([^.]*+).*$/$1/}

Re: Regex for Hostname

PacoPorro — Thu, 25 Sep 2025 08:00:08 GMT

Please check https://docs.dynatrace.com/docs/shortlink/regex

From my experience: pick the ungreedy option to test in regex101

with ^[A-Za-z0-9]{3}([A-Za-z]+?)\d+\.