[jira] [Created] (NIFI-6782) Create EL function for repeating a string

["Andy LoPresto (Jira)" <ji...@apache.org>]

Andy LoPresto created NIFI-6782:
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             Summary: Create EL function for repeating a string
                 Key: NIFI-6782
                 URL: https://issues.apache.org/jira/browse/NIFI-6782
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Extensions
    Affects Versions: 1.9.2
            Reporter: Andy LoPresto
            Assignee: Matt Burgess


As per a discussion with [~mattyb149], an Expression Language function which allowed for a number of repetitions of a string would be useful for generating arbitrary random text in a {{GenerateFlowFile}} processor. The usage would be:

{code}
${"some string here":repeat(4)} # repeats the literal string 4 times
${literal("this_is_also_an_attribute_name"):repeat(3)} # repeats the literal string 3 times
${my_string_attr:repeat(5)} # repeats the value in the attribute 5 times
${"explicit string":repeat(random():mod(10):plus(1))} # repeats the string between 1 and 10 times
{code}

If it's easy to implement, I think a multiple parameter option would also be convenient, but it is not a requirement: 

{code}
${"explicit string":repeat(random():mod(10):plus(1))} # repeats the string between 1 and 10 times
${"explicit string":repeat(1, 10)} # identical behavior to above
{code}



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