next unless m|^.*.txt\z|s;

According to this regex a filename without extension with at least 4 characters ending in txt matches. To match .txt files:

next unless /\.txt\z/s;

To find out the directory your are looking at, use $File::Find::dir.

— Arien

In reply to Re(2): path greping by Arien
in thread path greping by Sara

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