Upon further inspection of the documentation, it appears the module's author forgot or otherwise neglected to document the usage of ParseSub.

My guess is to do something like this: 
my $sub = sub { return shift =~ /$yesterdays_date/ };
my $output = $ftp->rget(ParseSub => $sub);

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In reply to Re^4: NET::FTP::Recursive by kwaping
in thread NET::FTP::Recursive by jdelmedico

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