How about a different approach?
#!/usr/bin/perl
use strict;
use warnings;
my ($start, $stop) = (qr '#ifdef|#if defined', qr '#endif');
open INPUT, '<', 'monks23.dat' or die "Error opening input: " . $!;
while (<INPUT>) {
if (/$start/ .. /$stop/) {
# Print the lines themselves
if (/$start/ or /$stop/) { print; }
# Skip the rest
next;
}
print;
}
close INPUT;
Glad I've finally found a useful non-numeric-iterating purpose for .. :)
Edit: Added comments, removed unnecessary regex escaping
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