There isn't a hard rule, just individual cases like

A.TL5E00* becomes +TL\E5C*, A.TL5F00* becomes +TL\F5C*, and A.TL5G00* becomes +TL\G5C*.

I've actually made great progress on my own. I think my only obstacle is still how to format the substitution string so it will read things like '\F' as a string and not a function

Here is my latest version. The output is ugly since it has the $VAR tags (this is something I should be able to fix), but I am feeling a lot better about where I am at

use strict;
use warnings;

use Data::Dumper;

my $input = 'TAV.stock.opt.oldsym.txt';
my @NewSym;

{

  unless(open(INPUT,$input))                           
  {                                                    
      die "\nCannot open $input\n";  
  }

    <INPUT>;
    
    my @lines;
    
    while(my $line = <INPUT>)
    {
    
      chomp $line;
     
     if ($line =~ m/^A.TL5E00/)
     
     {

     $line =~ s/A.TL5E00/+TL\E5C/g;    
    
     push @NewSym,$line;
     
     }
     
    }     
    
    close INPUT;
    
    print Dumper(@NewSym);
    
}
[download]

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