Проверка режима regex является допустимым IP
((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}
Jerome Choo
((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}
"((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}"//Example 192.168-192.178
//192.168.0.1-192.168.0.255
(?<ipstart>(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])([\.]*)){4})-(?<ipend>(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])([\.]*)){4})$