#!/usr/bin/perl --
use strict; use warnings;
my @finalnwlist = "192.169.32.0/255.255.255.0";
my @lines = "/file1 *(rw,sync,no_root_squash,no_subtree_check)";
foreach(@lines) {
    $_ =~  s/\*/@finalnwlist/g;
    print "$_\n";
}