@anony You can not use NiFi Expression Language (NEL) in component property names. NEL can only be used in component property values and even then, only when the component property supports Expression language. With ExtractText, any dynamic properties added will create a new FlowFile Attribute on the outbound FlowFile with an attribute name matching the property name "${reasonId}" and the attribute set the the capture group string extracted from the source FlowFiles content. Without understanding yoru complete use case, it is difficult to offer alternative possible solutions. Why is it important to set a FlowFile property name to a reasonID? FlowFile attribute property names only mean something to NiFi. So if you were able to create dynamic property names, then how would you programmatically use them later in your dataflow as FlowFiles will have a variety of Attribute property names? If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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