[jira] [Created] (NIFI-4408) Add a filter() EL function

["Pierre Villard (JIRA)" <ji...@apache.org>]

Pierre Villard created NIFI-4408:
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             Summary: Add a filter() EL function
                 Key: NIFI-4408
                 URL: https://issues.apache.org/jira/browse/NIFI-4408
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
            Reporter: Pierre Villard


It could be useful to have a filter function. Use case would be:

Input
'attribute' = "bfoo;bfaa;cfuu;bfii"

Expected output
'attribute' = "prefix_bfoo,prefix_bfaa,prefix_bfii"

With something like:

{code}
${allDelineatedValues("${attribute}", ";"):filter("^b"):replaceAll("(.*)", "prefix$1"):join(",")}
{code}

The "filter" function would act like "matches" but would return the subject element only if the subject element matches the regular expression. Or we could have a "filter" function allowing EL as argument to check a condition on each argument. That would certainly be more useful but not sure to see how the argument would be passed to the expression language. Something like:

{code}
${allDelineatedValues("${attribute}", ";"):filter("${_:matches("^b")}"):replaceAll("(.*)", "prefix$1"):join(",")}
{code}




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