If all your columns are fixed-width, you can use unpack
use strict;
use warnings;
while(<DATA>) {
my ($colA, $colB, $colC,$colD) = unpack "A19A15A7A45";
$colC = "N/A" if $colC eq "XYZ" and $colD =~ /Region/;
print "$colA -- $colB -- $colC -- $colD\n";
}
__DATA__
ValuesInColumn1 DataColumnB XYZ RowDescription|RowCode|Suppli
+er ID::Region
ValuesInColumn1 DataColumnB XYZ RowDescription|RowCode|Suppli
+er ID::Region
ValuesInColumn1 DataColumnB XYZ RowDescription|RowCode|Suppli
+er ID::Region
ValuesInColumn1 DataColumnB XYZ RowDescription at RowCode
ValuesInColumn1 DataColumnB ABC RowDescription at RowCode
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