topic Re: creating a new field using Regex in Splunk Search

creating a new field using Regex

mr_t2083 — Mon, 30 Apr 2018 20:53:41 GMT

how do you create a field using regex with the following example below
for example

exsamplefield=cpe:/o:microsoft:windows

I would like to extract microsoft from the above field?

What would be proper regex used to extract this?

Re: creating a new field using Regex

xpac — Mon, 30 Apr 2018 20:57:11 GMT

To build a proper regex, you need to describe your data properly, it has to have some reliable characteristics.
With your example above, multiple characteristics are possible, but without further example data it's hard to find those similarities.

This is an example: ^[^:]+:[^:]+:(?<yourfield>[^:]+:)
This one would assume that there is always to parts in that field, seperated by :, and the value you want to extract is between the second and third :. If that's true - here's your regex 😉

Re: creating a new field using Regex

PowerPacked — Mon, 30 Apr 2018 21:30:32 GMT

Hi mr_t2083

Please use this REX,

am uploading pic as this page will try to remove some characters from REX if directly posted.

& if you want to apply Rex to field itself, refer to this second pic

Thanks

Re: creating a new field using Regex

somesoni2 — Mon, 30 Apr 2018 21:35:12 GMT

Will it always be in same position?

Re: creating a new field using Regex

mr_t2083 — Tue, 29 Sep 2020 19:23:22 GMT

same position yes but not same letter, this is another example " cpe:/a:microsoft:malicious_software_removal_tool" so I'm looking for a way to distinguish between cpe:/o and cpe:/a

Re: creating a new field using Regex

somesoni2 — Tue, 01 May 2018 14:16:06 GMT

Have you tried any of solution below? They both should work for you. If you want little more specific regex based on your data, you can try this cpe\:\/(o|a)\:(?<YourFieldName>[^\:]+). (Basically look for either cpe:/a: or cpe:/o: and capture everything after that till next colon)

Re: creating a new field using Regex

woodcock — Tue, 01 May 2018 14:50:07 GMT

Like this:

... | rex field=exsamplefield="^(?:[^:]*:){2}(?<YourNameHere>[^:]+)"

Re: creating a new field using Regex

macadminrohit — Tue, 01 May 2018 15:19:22 GMT

cpe:\/(a|o):(?\w+):.*

microsoft will be captured in the named group

For testing, try www.regex101.com

Re: creating a new field using Regex

macadminrohit — Tue, 01 May 2018 15:19:42 GMT

cpe:\/(a|o):(?<fieldname>\w+):.*