How do you validate that a string is a valid IPv4 address in C++?

Question

I don\'t need to validate that the IP address is reachable or anything like that. I just want to validate that the string is in dotted-quad (xxx.xxx.xxx.xxx) IPv4 format, w

Answer 1

Boost.Regex would be appropriate.

bool validate_ip_address(const std::string& s)
{
   static const boost::regex e("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}");
   return regex_match(s, e);
}