Apache Nifi - Change Path in Attribute with UpdateAttribute Processor

Question

I want to change a Flowfile-Attribute with the UpdateAttribute Processor.

The Attribute "filename" is:

backup/int_backup/storage/teamname/toolname/path/bdsd9d83-dvvv8-41d9-a271-95b2284bd56c/20200420125822_11.zip

The beginning of the string shoult be cut and between teamname and toolname should be an other folder called archive like:

teamname/archive/toolname/path/bdsd9d83-dvvv8-41d9-a271-95b2284bd56c/20200420125822_11.zip

I created a regex that identified the teamname:

/[^/]*/[^/]*/([^/]*)/

And a Regex that marks everythings after the third "/":

/[^/]*/[^/]*/[^/]*/([^*]*)

I tried to build up the string by adding:

${filename:replaceAll('/[^/]*/[^/]*/([^/]*)/', '$1')}/archive/${filename:replaceAll('/[^/]*/[^/]*/[^/]*/([^*]*)', '$1')

However, the result is not the regex result, it is the regex itself.

Answer 1

You may use

${filename:replaceAll('^(?:[^/]+/){3}([^/]+)(.*)', '$1/archive$2')}

See the regex demo

Details

• ^ - start of string
• (?:[^/]+/){3} - three occurrences of 1+ chars other than / and then a /
• ([^/]+) - Group 1 ( $1 ): one or more chars other than /
• (.*) - Group 2 ( $2 ): the rest of the string.