Posted on 2012-04-03 00:56
乱78糟 阅读(1680)
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我所用的boost版本为:1.49.0
regex库需要提前编译好,并链接进来。如果你不想使用boost库,可以参考这篇,纯代码解析判断IP是否合法:
http://www.cppblog.com/smagle/archive/2010/01/08/105184.html#include <cstdlib>
#include <stdlib.h>
#include <boost/regex.hpp>
#include <string>
#include <iostream>
using namespace std;
using namespace boost;
void check_result(const string &expr, const string &str)
{
regex expression(expr);
cmatch what;
cout<<str<<endl;
if (regex_match(str.c_str(), what, expression))
{
for(int i = 1; i < what.size(); i++)
cout<<"segment\t"<<what[i].str()<<endl;
}
else
{
cout<<"Invalid!"<<endl;
}
cout<<endl;
}
int main(int argc, char* argv[])
{
string mac("12:34:af:1D:3D:5F");
//string str = "([0-9a-fA-F]{2}:){5}([0-9a-fA-F]{2})"; //这种只会打印后两段
string mac_fmt = "([0-9a-fA-F]{2}):([0-9a-fA-F]{2}):([0-9a-fA-F]{2})"
":([0-9a-fA-F]{2}):([0-9a-fA-F]{2}):([0-9a-fA-F]{2})";
check_result(mac_fmt, mac);
string ip1 = "128.10.3.13"; //合法
string ip2 = "255.10.3.13"; //不合法,leftmost法则,所以不能匹配第一段的最后一节
string ip_fmt = "(25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])"
"."
"(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])"
"."
"(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])"
"."
"(25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])";
check_result(ip_fmt, ip1);
check_result(ip_fmt, ip2);
return 0;
}