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This article mainly explains "what are the regular expressions in C++". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought. Let's study and learn what regular expressions are in C++.

1. C regex/* write by xingming * time: 15:51:53 * for: test regex * * / # include # include using namespace std;const int times = 1000000 leading int main (int argc,char** argv) {char pattern [512] = "finance\ .sina\ .cn | stock1\ .sina\ .cn | 3G\ .sina\ .com. * (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

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