Joe, thanks for your reply. I wonder whether a typo in my example might have made what I would like to achieve slightly confusing. My mapping file looks like this (note value in bold as opposed to "2" as included in my first post":
Header1;Header2;Header3 A;some text;*A2 * Am I correct in saying that ReplaceTextWithMapping does not allow multiple matching groups? The main problem, also, seems to come from the fact that my input Json has different keys, but same values: {"field1" : "A", "field2" : "A", "field3": "A" } I am not sure how to go about it, if ReplaceTextWithMapping is not the ideal solution. Any further suggestion/recommendation is much appreciated. Thank you, I. -- View this message in context: http://apache-nifi-developer-list.39713.n7.nabble.com/Help-with-ReplaceTextWithMapping-processor-multi-column-mappings-tp10280p10338.html Sent from the Apache NiFi Developer List mailing list archive at Nabble.com.