how to check file value if it contains single word in a variable

Hi

Basically what I am trying to do is.. I am storing the wifi SSID name to a file everytime i am connected to a new SSID separated by commas.

Then I want to stored files which contains the list of SSID with the current SSID I am on.

Can anyone please explain me how do I do that?

I am new to tasker and don't know how to make it work...

Thanks a lot in advance.

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