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Question

filter expresion in route with wildcard

  • March 11, 2025
  • 6 replies
  • 43 views
J

Hi,

Maybe a simple answer (i hope). For a route we want to filer the host.name, but there are a lot of host in the list so a wildcard is the best way to filter.

So doing like 'drnms10*.dmz.somewhere.nl' in the filter for the servers matching with this wildcard.

But with a filter 'host == 'drnms10*.dmz.somewhere.nl'' wil not work. What is the best way to do this?

I tried with a C.lookup and a lookup file.. it wil work. But stil have top maintain a list. And is a C.lookup not very slow in a filter?

Thanks for the answer :)

greets

Jari

    6 replies

    David Maislin

    host.endsWith('.dmz.somewhere.nl')

    OR

    /\.dmz.somewhere\.nl$/i.test(host)

    J
    • Jari Weststrate
    • Author
    • Participating Frequently
    • March 11, 2025

    Thanx David,

    Not exactly what i wanted. I like to have a filter for every host staring with drnms10 .. and everythine in between, but also ending with .dmz.somewhere.nl.

    hence the drnms10*.dmz.somewhere.nl

    Jon Rust
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    • Jon Rust
    • Employee
    • March 11, 2025

    David's answer still helps. You just need to create a regex expression that meets your needs. "Wildcard matching" is not supported in javascript.

    David Maislin

    /^drnms10/.+\.dmz.somewhere\.nl$/i.test(host)

    J
    • Jari Weststrate
    • Author
    • Participating Frequently
    • March 11, 2025

    Ahhh now i see. Yes this helps indeed.

    Does it matter about the cpu resources it cost?

    I can make a filter with a lot off host in the filter or this regex.

    I don't like to use a list of servers in the filter, but when it cost a lot of cpu power (with loads of events i mean).

    Jon Rust
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    • Jon Rust
    • Employee
    • March 11, 2025

    Yes, CPU performance could be a concern. You normally want to make your filters as efficient as possible. I cannot tell from the info that you've provided what you're trying to do tho.

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