Field extraction using dynamic regular expression - rex command

[arpitpropay]

I am trying to extract key value pairs from JSON events using rex command

mysearch | rex field=_raw max_match=0 "\"(?<Key>\b\w+[^\":]*)\":(?!\s*{\[)\"*(?<Value>(?!\[{|{|\[)[^(,|}|\")]*)" 

I have a single column CSV lookup with all the key names I am interested in

| inputlookup my_fields_json.csv | fields FieldName 

Is there a way to use the lookup to make my rex command regular expression dynamic so I only extract the fields I am interested in?

[harsmarvania57]

Duplicate of https://answers.splunk.com/answers/808978/field-extraction-using-rex-command-dynamic-regex-w.html