Append or Prepend Dollar Signs ($) in NiFi Using the literal Function

Question

I have requirement where I need to append and prepend the attribute with "$$$". how ever, Nifi expression language is appending or prepending with "\$"

For example: if attribute named "myattr" value is "This is Test"

when I do ${myattr:prepend('$$$'):append('$$$')}

I am expecting "$$$This is Test$$$"

but the output is "\$This is Test\$"

Is there any way to append or prepend the attribute with "$$$"

MattWho · Accepted Answer

@SS_Jin
Another option is to use the NiFi expression Language (NEL) function "literal()}" in the NEL statement:

${myattr:append(${literal('$$$')}):prepend(${literal('$$$')})}

This removes the need to you are using the correct number of "$" to escape $ in the NEL.

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Thank you,
Matt

Shu_ashu · Answer

@Anil Reddy use 9$ instead of 3$${myattr:prepend('$$$$$$$$$'):append('$$$$$$$$$')}in expression language if you use 3$ are results as 1$ so we need to use 9$ if you want 3$ sign to be added to the attribute value.Input:-"myattr" value is "This is Test"expression:-${myattr:prepend('$$$$$$$$$'):append('$$$$$$$$$')}Output:-$$$This is Test$$$

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