[英]Regular Expression iterator is not working in Cpp
I am working with C++ on Visual Studio 2010 (I don't think its v11 standard but I haven't checked). 我在Visual Studio 2010上使用C ++(我不认为它的v11标准,但我没有检查)。
I am trying to extract out the IP address of a tracert with the following code: 我试图用以下代码提取tracert的IP地址:
#include <iomanip>
#include <iostream>
#include <string>
#include <regex>
using namespace std;
typedef regex_iterator<string::iterator> regexp;
#define MAX_BUFFER 255
int main() {
string out;
char buffer[MAX_BUFFER];
smatch m;
regex e(" 1.+\\[(.+)\\]");
FILE *stream = _popen("tracert SOMEHOSTNAME", "r");
while ( fgets(buffer, MAX_BUFFER, stream) != NULL ) {
out = buffer;
regexp rit (out.begin(), out.end(), e);
regexp rend;
while (rit != rend) {
cout << rit->str() << endl;
++rit;
}
}
_pclose(stream);
cout << "Done.";
cin >> buffer;
}
however, the regexp is not extracting out the group itself. 但是,正则表达式并没有提取出组本身。 Instead it is just spitting back the full line! 相反,它只是吐出全线!
I thought I was following examples very carefully but it seems I am not using regex_iterator correctly. 我以为我非常仔细地遵循了例子,但似乎我没有正确使用regex_iterator。
1 - How best can I extract the IP from this string 1 - 如何最好地从此字符串中提取IP
(Side question - is there a C++ function that will go into the network and get the IP from a hostname just like tracert our pint? Another that will get the mac address just like arp -a) (附带问题 - 是否有一个C ++函数将进入网络并从主机名获取IP就像跟踪我们的品脱?另一个将获得mac地址就像arp -a一样)
I don't have MSVC, and GNU has broken std::regex support, so I've played with `boost::regex' here: 我没有MSVC,GNU已经破坏了std :: regex支持,所以我在这里玩过'boost :: regex':
regex e("^\\s*1\\s.*?\\[(.*?)\\]");
Note this: 请注意:
1
character (so it won't match the line starting with 13
, eg) 后不强制至少1个空间1
字符(因此它不会匹配线开始13
,例如) #include <iostream>
#include <string>
#include <boost/regex.hpp>
using namespace std;
using boost::regex;
using boost::regex_iterator;
#define MAX_BUFFER 255
int main()
{
char buffer[MAX_BUFFER];
regex e("^\\s*1\\s.*?\\[(.*?)\\]");
FILE *stream = popen("cat input.txt", "r");
while(fgets(buffer, MAX_BUFFER, stream) != NULL)
{
typedef regex_iterator<string::iterator> regit;
string out = buffer;
regit rit(out.begin(), out.end(), e);
regit rend;
while(rit != rend)
{
cout << (*rit)[1].str() << endl;
++rit;
}
}
pclose(stream);
cout << "Done.\n";
}
This appears to work for input.txt
: 这似乎适用于input.txt
:
Tracing route to 11.1.0.1 over a maximum of 30 hops
1 2 ms 3 ms 2 ms [157.54.48.1]
2 75 ms 83 ms 88 ms [11.1.0.67]
3 73 ms 79 ms 93 ms [11.1.0.1]
Trace complete.
printing: 打印:
157.54.48.1
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