yeah, this is what I ended up doing. I used the regex previously mentioned to find them, though. There was no way I was going to eyeball ~20,000 lines of code... This is what I ended up using to find them; hopefully someone can look at it and use it later:

#!/usr/bin/env perl 

# find_extended_chars.txt

# this script finds any non-alphanumeric characters, codes, etc in a
# given input file and prints the line & line number so that it can be
# changed.

use strict;
use Cwd;

foreach my $file (@ARGV) {
    my $error = 0;
    my $line = 1;
    open FILE, $file;
    
    while (<FILE>){
    if ($_ =~ m/[^[:ascii:]]/ ){
        if (!$error){
        print $file."\n";
        $error = 1;
        }
        print $line. "\t".$_;
    }   
    $line++;
    }
}
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