You can use the ExtractText processor and provide it a regex also in order to pull the values into attributes. For example, you could have: field1: (.{2}).{6} field2: .{2}(.{4}).{2} field3: .{6}(.{2}) This assumes, though, that each FlowFile has only a single line. You could use SplitText, for example, to split each FlowFile into a separate line perhaps? I think we may need more context about what you're trying to accomplish to provide a more detailed answer.
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