isIPv4 method

bool isIPv4(
  1. String? ip
)

验证IP地址（IPv4）

Implementation

bool isIPv4(String? ip) {
  const pattern = r'^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$';
  return hasMatch(ip, pattern);
}