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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