SPL: extract logfile name from source field

[danielsofoulis]

Hi, I am trying to setup a dropdown bar for a dashboard and would like to setup dynamic inputs based on the source log file, as there are many different sites being built and torn down.

example source log name:

D:\Apache\logs\example.com.au_accessLog_2017-04-20-00_00_00.log  

I would like to extract "example.com.au" from the above source log file and drop everything else. Then make it a distinct value. This value would then be selectable in the dropdown bar to filter on that site.

This is what I've attempted but is not returning what I need.

index=example sourcetype=test:access | eval baseurl = mvindex(split(source,"/", -1) | top baseurl

Thanks in advance.

[cpetterborg]

The following should work for you to extract the part you want from the source field:

index=example sourcetype=test:access | rex field=source "\\(?P<file>[^_\\]+)_[^\\]$"

[danielsofoulis]

Thank you for answering. I ran the search with the rex you provided and got the following error:
Error in 'rex' command: Encountered the following error while compiling the regex '(?P[^]+)[^]$': Regex: missing terminating ] for character class

[jkat54]

...| rex field=source "logs\\(?<fqdn>\S+)_accessLog" | top fqdn

[danielsofoulis]

Hi thanks for you help, but I'm also getting an error when I run your rex:
Error in 'rex' command: Encountered the following error while compiling the regex 'logs(

[jkat54]

Sorry I had my question mark in the wrong place.

[danielsofoulis · Accepted solution]

I've managed to get it working using
rex field=source "\w+\(?P[\w+]+)_accessLog\S+$"| top 20 site