One capture group value becomes the field name for the next capture group

I'm using PCRE2 (PHP >=7.3) in Splunk. I have data that is major delimited by carriage returns/new lines and minor delimited by commas as key/value pairs.

key1="value1",key2="value2",key3="value3",key4="... and so on. The number of key value pairs varies per event and I'd like to be able capture an arbitrary number of key values but in order to do so I would need to dynamically name the values. For example, the value of key1 would become the field name of the value1, key2 would become the field name of value2, etc for as many key/value pairs are found. (.*?)\=\"(.*?)\" is as far as I've gotten but Splunk requires field extractions to be named.

Is there a way to do this?

Thanks in advance, ~Tensore

You can do that at index time using props and transform. There's an example of it at https://docs.splunk.com/Documentation/Splunk/8.2.2/Knowledge/Exampleconfigurationsusingfieldtransforms#Handling_events_with_multivalue_fields

Put this in your transforms.conf file:

[mytransform]
REGEX = ([^=]+)=([^,]+)
FORMAT = $1::$2
REPEAT_MATCH = true
MV_ADD = true

Then put this in props.conf:

[mysourcetype]
TRANSFORMS-parse = mytransform