How to find visually selected string in different file

Hi,
I am trying to
In a open file sim.log.
1) Visually select a string ( with white space)
2) Split open ~/project/string_file_list and Search this string in
this new open file.
3) map this operation to some key binding.

I could not find any help on web related to this.

Thanks,
Ashiwn.

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