C++中三种正则表达式比较（C regex，C ++regex，boost regex）

工作需要用到C++中的正则表达式，所以就研究了以上三种正则。

1，C regex

/*  write by xingming
 *  time:2012年10月19日15:51:53
 *  for: test regex
 *  */

#include <regex.h>
#include <iostream>
#include <sys/types.h>
#include <stdio.h>
#include <cstring>
#include <sys/time.h>

using namespace std;
const int times = 1000000;

int main(int argc,char** argv)
{
    char pattern[512]="finance\.sina\.cn|stock1\.sina\.cn|3g\.sina\.com\.cn.*(channel=finance|_finance$|ch=stock|/stock/)|dp.sina.cn/.*ch=9&";
    const size_t nmatch = 10;
    regmatch_t pm[10];
    int z ;
    regex_t reg;
    char lbuf[256]="set",rbuf[256];
    char buf[3][256] = {"finance.sina.cn/google.com/baidu.com.google.sina.cndddddddddddddddddddddda.sdfasdfeoasdfnahsfonadsdf",
                    "3g.com.sina.cn.google.com.dddddddddddddddddddddddddddddddddddddddddddddddddddddbaidu.com.sina.egooooooooo",
                    "http://3g.sina.com.cn/google.baiduchannel=financegogo.sjdfaposif;lasdjf.asdofjas;dfjaiel.sdfaosidfj"};
    printf("input strings:\n");
    timeval end,start;
    gettimeofday(&start,NULL);
    regcomp(&reg,pattern,REG_EXTENDED|REG_NOSUB);
    for(int i = 0 ; i < times; ++i)
    {
        for(int j = 0 ; j < 3; ++j)
        {
            z = regexec(&reg,buf[j],nmatch,pm,REG_NOTBOL);
/*          if(z==REG_NOMATCH)
                printf("no match\n");
            else
                printf("ok\n");
                */
        }
    }
    gettimeofday(&end,NULL);
    uint time = (end.tv_sec-start.tv_sec)*1000000 + end.tv_usec - start.tv_usec;
    cout<<time/1000000<<" s and "<<time%1000000<<" us."<<endl;
    return 0 ;
}