How to filter a text aggregator string data

Hello, first of all, I would like to congratulate this great community. The help you provide here is incredible. I hope you can help me too.

I have used a Text Aggregator and I want to filter the result with a text condition, whether it contains or does not contain something, but it does not filter the way I expect it to.

Could you help me? I cannot share the downloaded files because they contain sensitive information.

Thank you in advance.