This processor routes FlowFiles based on their attributes using the NiFi Expression Language. Users add properties with valid NiFi Expression Language Expressions as the values. Each Expression must return a value of type Boolean (true or false).
Example: The goal is to route all files with filenames that start with ABC down a certain path. Add a property with the following name and value:
In this example, all files with filenames that start with ABC will follow the ABC relationship.