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set something 111.111.111.111 255.255.255.0

if (/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/){
  s/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/xxx.xxx.xxx.xxx/;
  print VPNOUTFILE "$_";
}

set something xxx.xxx.xxx.xxx 255.255.255.0

set something xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx