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use strict;
use warnings;
use LWP 5.64;
use LWP::Simple;

# apache file listing
open( LISTGPN, "../Desktop/GPNs.html" );

# destination file with one GPN id per line
open( NEWGPN, ">gpn.txt" );

my $record;
# Read one line from the file
while ($record = <LISTGPN>) {
    # Try to find the GPN-number in this line
    if( $record =~ m/A\ HREF=\"(\S*?).html\"/i ) {
        # If found print the number to a new file and add a line-ending.
        print NEWGPN $1."\n";
    else { print "ERROR for ".$record; }