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shell script : how to extract file content before after a search string for the files in directory

I want to read the file contents before and after search string. The contents may be 25 or 50 chars will be fine.

example :  file01
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I want extract strings before & after discussion  in the above file given as output.

The output should display  in below format :
before 25 chars + search string  + 25 chars

LinuxWindows BatchShell ScriptingPythonUnix OS

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8/22/2022 - Mon