[C++知识库]c++ regex用法实例 2

c++ regex用法实例

目的

,承接用法实例1，此次目的是可以发现ip地址和域名地址是否基本合法

code

#include <regex>
#include <iostream>
#include <string>
using namespace std;

#define GETN(x) sizeof(x)/sizeof(char*)
int main()
{
	regex Pattern_ip("((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])");
	regex Pattern_domain("([0-9A-Za-z\\-_\\.]+)\\.([0-9a-z]+\\.[a-z]{2,3}(\\.[a-z]{2})?)");

	const char *ips[] = { "192.168.20.250","1.1.1.1","abc" };
	const char *domain[] = { "192.168.20.250","1.1.1.1","www.baidu.com.cn" };
	
	int n = GETN(ips) ;
	for (int i = 0; i < n; i++)
	{
		//string s = ips[i];
		if (regex_match(ips[i], Pattern_ip))
		{
			cout << "ok ip" << endl;
		}
		else
		{
			cout << "ip address not ok" << endl;
		}

	}
	n = GETN(domain);
	for (int i = 0; i < n; i++)
	{
		if (regex_match(domain[i], Pattern_domain))
		{
			cout << "ok domain" << endl;

		}
		else
		{
			cout << "domain not ok" << endl;
		}
	}
	return 0;
}

结果