頭文件

#include <regex>

regex_match：整個字符串是否匹配

按 Ctrl+C 復制代碼 按 Ctrl+C 復制代碼

regex_match：只返回第一個匹配結(jié)果

smatch rr1;smatch rr2;cout << boolalpha << regex_search(s1, rr1, reg1) << endl;　　//truecout << "s1匹配結(jié)果：" << rr1.str() << endl; 　　　　　　　　　　//saturdaycout << boolalpha << regex_search(s2, rr2, reg1) << endl;　　//truecout << "s1匹配結(jié)果：" << rr2.str() << endl;　　　　　　　　　　 //saturdaycout << endl;

iterator：返回多個匹配結(jié)果

類似于指針，調(diào)用成員要用"->"

cout << "iterator結(jié)果：" << endl;sregex_iterator it(s2.begin(), s2.end(), reg1);sregex_iterator end;for(; it != end; ++it){cout << it->str() << endl;//cout << *it << endl; 錯誤 }cout << "token_iterator結(jié)果：" << endl;sregex_token_iterator tit(s2.begin(), s2.end(), reg1);sregex_token_iterator tend;for(; tit != tend; ++tit){cout << tit->str() << endl;cout << *tit << endl;}

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子表達式匹配

regex reg2("(\\d{1,3}):(\\d{1,3}):(\\d{1,3}):(\\d{1,3})");string ip = "0:11:222:333";smatch m; regex_match(ip, m, reg2);cout << "輸出：str()" << endl;cout << m.str() << endl;　　 //0:11:222:333cout << m.str(1) << endl;　　//0cout << m.str(2) << endl;　　//11cout << m.str(3) << endl;　　//222cout << m.str(4) << endl;　　//333cout << "輸出：[i]" << endl; //結(jié)果同上cout << m[0] << endl;cout << m[1] << endl;cout << m[2] << endl;cout << m[3] << endl;cout << m[4] << endl;

多個匹配結(jié)果

string ip2 = "0:11:222:333 4:55:66:7";sregex_iterator ip_it(ip2.begin(), ip2.end(), reg2);sregex_iterator ip_end;for(; ip_it != ip_end; ++ip_it){cout << ip_it->str() << endl;cout << ip_it->str(1) << endl;cout << ip_it->str(2) << endl;cout << ip_it->str(3) << endl;cout << ip_it->str(4) << endl;}

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總的程序：

#include <iostream> #include <string> #include <regex> using namespace std;int main() {//regex_match匹配整個字符串regex reg1("\\w+day");string s1 = "saturday";string s2 = "saturday and sunday";smatch r1;smatch r2;cout << boolalpha << regex_match(s1, r1, reg1) << endl;cout << boolalpha << regex_match(s2, r2, reg1) << endl;cout << "s1匹配結(jié)果：" << r1.str() << endl;cout << "s2匹配結(jié)果：" << r2.str() << endl;cout << endl;//regex_match只返回第一個匹配結(jié)果 smatch rr1;smatch rr2;cout << boolalpha << regex_search(s1, rr1, reg1) << endl;cout << "s1匹配結(jié)果：" << rr1.str() << endl;cout << boolalpha << regex_search(s2, rr2, reg1) << endl;cout << "s1匹配結(jié)果：" << rr2.str() << endl;cout << endl;//使用iterator返回多個匹配結(jié)果//結(jié)果要用->cout << "iterator結(jié)果：" << endl;sregex_iterator it(s2.begin(), s2.end(), reg1);sregex_iterator end;for(; it != end; ++it){cout << it->str() << endl;//cout << *it << endl; 錯誤 }cout << "token_iterator結(jié)果：" << endl;sregex_token_iterator tit(s2.begin(), s2.end(), reg1);sregex_token_iterator tend;for(; tit != tend; ++tit){cout << tit->str() << endl;cout << *tit << endl;}//子表達式匹配regex reg2("(\\d{1,3}):(\\d{1,3}):(\\d{1,3}):(\\d{1,3})");string ip = "0:11:222:333";smatch m; regex_match(ip, m, reg2);cout << "輸出：str()" << endl;cout << m.str() << endl;cout << m.str(1) << endl;cout << m.str(2) << endl;cout << m.str(3) << endl;cout << m.str(4) << endl;cout << "輸出：[i]" << endl;cout << m[0] << endl;cout << m[1] << endl;cout << m[2] << endl;cout << m[3] << endl;cout << m[4] << endl;//輸出結(jié)果同上//regex_search(ip, m, str2);cout << endl;string ip2 = "0:11:222:333 4:55:66:7";sregex_iterator ip_it(ip2.begin(), ip2.end(), reg2);sregex_iterator ip_end;for(; ip_it != ip_end; ++ip_it){cout << ip_it->str() << endl;cout << ip_it->str(1) << endl;cout << ip_it->str(2) << endl;cout << ip_it->str(3) << endl;cout << ip_it->str(4) << endl;}return 0;}

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參考：

http://www.cnblogs.com/zhuyp1015/archive/2012/04/08/2438191.html

http://www.cnblogs.com/zhuyp1015/archive/2012/04/08/2438215.html

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