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my %files = ( colors => 'colors.dat', tests => 'test.txt', ... open IN, "<$filepath/$files{$siteinfo[1]}" or someErrorRoutine( "Can't open $filepath/$siteinfo[1] for reading: +$!" );
$siteinfo[1] =~ /^[^.]+/(\w+\.\w+)$/ or someErrorRoutine( "Regex failed" ); my $fileToOpen = $1; # $fileToOpen untainted