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From Charlie Frasure <>
Subject Re: Expression language
Date Thu, 12 Nov 2015 23:39:55 GMT
I am attempting to convert many files with various encoding to a common
character set.  I have an attribute called 'encoding' that stores the
result of an encoding test.  When passing that value as the source to the
ConvertCharacterSet processor, it didn't match the processor's expected
values.  I added an UpdateAttribute processor that is attempting to compare
'encoding' to known valid Java character sets.  That comparison is where I
am having trouble.  In SQL it would be "where encoding in ('utf-8', 'utf-16',
'utf-16be', 'utf-16le', 'us-ascii', 'iso-8859-1')."

Based on this document, I thought that 'literal' would be a good function
combined with 'contains'.

Once the comparison is working, I will send the matching files to the
ConvertCharacterSet processor.

On Thu, Nov 12, 2015 at 6:24 PM, Matthew Clarke <>

> Charlie,
>      I am not sure what your use case is here. 'Literal' is not a NiFI
> expression language function. If you can give me some detail on what you
> are trying to do, I can help you with the NiFi expression language strategy
> to accomplish it. Did you create a FlowFile attribute named 'encoding'?
> Matt
> On Nov 12, 2015 6:15 PM, "Charlie Frasure" <>
> wrote:
>> Typos on my regex were just in the email, not the processor.  It should
>> have read ${encoding:match...
>> On Thu, Nov 12, 2015 at 6:03 PM, Charlie Frasure <
>>> wrote:
>>> This expression does not parse without error:
>>> ${literal('utf-8 utf-16 utf-16be utf-16le us-ascii
>>> iso-8859-1'):contains(encoding)}
>>> Is it not possible to use an attribute in a comparison function?
>>> Unexpected token 'encoding' at line 1, column 73. Query: ${literal(utf-8
>>> utf-16 utf-16be utf-16le us-ascii iso-8859-1):contains(encoding)}
>>> Alternatively, I think a regex should work, but didn't immediately get a
>>> match using:
>>> ${enconding.match('utf-8|utf-16|utf-16be|utf-16le|us-ascii|iso-8859-1')}
>>> Charlie

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