You are missing a . in your pattern: 

my $filepattern = qr/(.*).foo__bar_ar/

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Also, I'm totally confused about what is in your retrieve files.
Please show (in code blocks) at least the first twenty lines from a Data::Dumper or Data::Dump print of one of your "retrieve" files as it is immediately after it is read in.

In reply to Re^3: Consolidating nstore arrays by tybalt89
in thread Consolidating nstore arrays by Speed_Freak

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