Re: filter the files in a folder on the basis of some variable present in them

"it doesn't work

How doesn't it work? Show us the error messages (verbatim, please) and the warnings, if any. Provide a narrative description of how output is different than your desire.

Help us to help you.

Questions containing the words "doesn't work" (or their moral equivalent) will usually get a downvote from me unless accompanied by:

code
verbatim error and/or warning messages
a coherent explanation of what "doesn't work actually means.

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