topic Matching Host Names with Regex in Open Q&A

Matching Host Names with Regex

DanielS — Mon, 15 Mar 2021 20:17:45 GMT

Hi community, I wrote the following Regex to match either hostname formats:

(?:ocp-p[a-zA-Z]-a\d{0,2}|worker-\d{0,2}\.ocp4-re)\.cloud\.com

The hostname are dynamically created.

I've check the rule on Regex 101 and matches everything as expected, but when I go to Dynatrace and hit preview only matches example 1 and 4. What I'm doing wrong?

worker-10.ocp4-re.cloud.com
ocp-pe-a2.cloud.com
ocp-pe-a42.cloud.com
worker-0.ocp4-re.cloud.com

Thanks in advance.

Re: Matching Host Names with Regex

Babar_Qayyum — Tue, 16 Mar 2021 06:16:24 GMT

Hello @DanielS

Please try the following:

(?:.*cloud.com)

Regards,

Babar

Re: Matching Host Names with Regex

ChadTurner — Fri, 19 Mar 2021 19:00:33 GMT

I'd recommend using what @Babar_Qayyum supplied, if that still fails (which i dont expect) then maybe make 4 rules, one for each line item to ensure they are working correctly.

Re: Matching Host Names with Regex

DanielS — Fri, 19 Mar 2021 20:24:06 GMT

Thanks, finally instead of doing one rule, I made one for 1 and 4 and other one for the 2,3. It's not what I wanted, but the field is limited to 80 chars, so If in a future I add more examples it would be easier to maintain.

Re: Matching Host Names with Regex

ChadTurner — Fri, 19 Mar 2021 20:27:26 GMT

great to hear, but yes I've run into issues too with character limits for regex, but still cut down on the overall rules. glad it worked

Maybe toss in a RFE for that limit to be raised.

Re: Matching Host Names with Regex

DanielS — Fri, 19 Mar 2021 20:28:49 GMT

Good Idea, I've done a request and wait if it accepted. Thanks for your answers.

Re: Matching Host Names with Regex

DanielS — Fri, 19 Mar 2021 20:29:12 GMT

thanks for your answer.

Re: Matching Host Names with Regex

ChadTurner — Fri, 19 Mar 2021 20:29:45 GMT

toss along the link and ill up vote it

Re: Matching Host Names with Regex

DanielS — Fri, 19 Mar 2021 20:36:59 GMT

https://community.dynatrace.com/t5/Dynatrace-product-ideas/RFE-Raise-Regex-Field-Limit/idi-p/163183

Done