lookup csv but need to the lookup file contains several fields that need to be concatenated to match event field

[loganramirez]

Hi.

I have a lookup file with phone numbers broken down into their parts, so:
cc,npa,nxx,list
1,210,5551234,good
1,512,7779876,bad

My event stream has e164 phone numbers, so:
+12105551234
+15127779876

i'd like to use the lookup command, but can't find a way to natively join this data and looking for ideas.

currently i am able to use join, like this:

...
| join number
[
| inputlookup lookupfile.csv | eval number="+".cc.npa.nxx

but I've learned through this group mostly to try and avoid 'join' because of limitations and 'it basically applying SQL and this ain't SQL'.

I thought about 'breaking apart' the number field into (3) fields and then passing several looks like in the example page linked above, but this feels backwards when what i'd prefer to do is join the data in the csv.

So another idea was to create a report that does that and creates a new CSV (|output lookup), but that feels unnecessary, too.

Any thoughts?

THANK YOU!

[ITWhisperer · Accepted solution]

The way to do it is to split the number up and do your lookup using those fields in a single lookup passing all three fields

| rex  field=number "\+(?<cc>\d)(?<npa>\d\d\d)(?<nxx>\d+)"
| lookup lookupfile.csv cc npa nxx

[loganramirez]

Amazing!  Appreciate the straight up regex, too.  This was the way I thought I'd have to do, but didn't realize it 'exact matched' all three keyes (all 3 have to match to be accepted).

Thank you!!!