Splunk Search

How to use regex command to match a certain amount of characters in a field?

showard22
New Member

I want to use Splunk to match on a field name for accounts with exactly 4 characters, all numbers and letters.

I keep trying:

index=corp sourcetype=importantlogs | fields Account EventType | regex Account="[a-zA-Z0-9]{4}"

I feel like I'm overlooking something super simple and I've been stuck on this for a few hours. Any outsider thoughts?

0 Karma

DalJeanis
Legend

woodcock has a good answer, once you change the period to a more limited character class (\w is the simplest) For the same effect of keeping only accounts that are exactly 4 "word" characters, you could also use...

| where like(Account, "^\w{4}$"
0 Karma

woodcock
Esteemed Legend

You did not anchor it; try this:

index=corp sourcetype=importantlogs | fields Account EventType | regex Account="^.{4}$"
0 Karma

DalJeanis
Legend

Need a smaller character class, only letters and numbers.

0 Karma

woodcock
Esteemed Legend

A simpler match character is more efficient and worth the infinitesimally small risk of a false positive.

0 Karma
Get Updates on the Splunk Community!

See just what you’ve been missing | Observability tracks at Splunk University

Looking to sharpen your observability skills so you can better understand how to collect and analyze data from ...

Weezer at .conf25? Say it ain’t so!

Hello Splunkers, The countdown to .conf25 is on-and we've just turned up the volume! We're thrilled to ...

How SC4S Makes Suricata Logs Ingestion Simple

Network security monitoring has become increasingly critical for organizations of all sizes. Splunk has ...