I'm new to this forum and Splunk in general, so thank you in advance for all your help.
I'm trying to use
rex in Calculated fields to extract some text and then further format it.
The rex itself looks like this:
but when I pass it along to the Eval Expression field, I'm getting the following error message:
Encountered the following error while trying to save: In handler 'props-eval': Invalid operator
The regex works fine in Search.
Any help will be much appreciated.
You can eval the results of extractions performed with rex, but you can't eval them in the rex itself (nor can you rex inside an eval).
Try it in two steps.
rex field=_raw "purple\s+widgets\s+(?<purplewidgets>\d+)\s+orange\s+widgets\s+(?<orangewidgets>\d+)" | eval totalwidgets=orangewidgets+purplewidgets
Assuming you have an event like
somedatetime, purple widgets 5 orange widgets 3
What pops out the other end will be, among some other fluff,
orangewidgets purplewidgets totalwidgets 3 5 8
If you want to confirm, this is the exact, run-anywhere search you can test with.
| gentimes start="1/1/2016" end="1/2/2016" | eval myval="somedatetime, purple widgets 5 orange widgets 3" | rex field=myval "purple\s+widgets\s+(?<purplewidgets>\d+)\s+orange\s+widgets\s+(?<orangewidgets>\d+)" | eval totalwidgets=orangewidgets+purplewidgets
Gentimes just creates a single faked up "time" to work with.
I create an "event" to work with with the first
rex parses the field myval that I just created and extracts the digits for purple and orange widgets
eval does some math with them to find a total.
If instead you are trying to do a rex on a field you've created - well, as far as I know that works as long as it's a string and may work regardless. You can see I do that with "myval" above, in fact!
The rex itself is a command, not a function that can be used within EVAL in search/ calculated fields. If you can provide some sample values and the formatting you're planning to do, we can suggest alternatives. My first guess will be the
replace function which comes with