How to list unsuccessfully extracted fields event?

[hjwang]

dear all

as title mentioned , i found some fields extraction can not reach 100 percent on total event, how can i list or query this unsuccessfully extracted fields to see unexpected log format?

thanks in advance.

[eashwar]

you can also use this

YourSearch NOT fieldName="*"

happy splunking.

[sideview · Accepted solution]

If you're trying to extract a field called 'fieldName', and you have a search that you think should extract the value from all events, run this:

<your search> | where isnull(fieldName)

You can take those events and look at them in a tool like RegexBuddy to see where the extraction is breaking down. You can also play around with other search language tricks that can show you representative events across the whole set, like:

<your search> | where isnull(fieldname) | dedup punct

[hjwang]

Thanks a lot,nick. It's really helpful for me :).