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头文件 #include <regex> regex_match:整个字符串是否匹配 regex reg1("\\w+day"); string s1 = "saturday"; string s2 = "saturday and sunday"; smatch r1; smatch r2; cout << boolalpha << regex_match(s1, r1, reg1) << endl; //true cout << boolalpha << regex_match(s2, r2, reg1) << endl; //false cout << "s1匹配结果:" << r1.str() << endl; //saturday cout << "s2匹配结果:" << r2.str() << endl; //空 cout << endl; regex_match:只返回第一个匹配结果 smatch rr1; smatch rr2; cout << boolalpha << regex_search(s1, rr1, reg1) << endl; //true cout << "s1匹配结果:" << rr1.str() << endl; //saturday cout << boolalpha << regex_search(s2, rr2, reg1) << endl; //true cout << "s1匹配结果:" << rr2.str() << endl; //saturday cout << endl; iterator:返回多个匹配结果 类似于指针,调用成员要用"->" cout << "iterator结果:" << endl; sregex_iterator it(s2.begin(), s2.end(), reg1); sregex_iterator end; for(; it != end; ++it) { cout << it->str() << endl; //cout << *it << endl; 错误 } cout << "token_iterator结果:" << 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; }
子表达式匹配 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 << "输出:str()" << endl; cout << m.str() << endl; //0:11:222:333 cout << m.str(1) << endl; //0 cout << m.str(2) << endl; //11 cout << m.str(3) << endl; //222 cout << m.str(4) << endl; //333 cout << "输出:[i]" << endl; //结果同上 cout << m[0] << endl; cout << m[1] << endl; cout << m[2] << endl; cout << m[3] << endl; cout << m[4] << endl; 多个匹配结果 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; }
总的程序: #include <iostream> #include <string> #include <regex> using namespace std; int main() { //regex_match匹配整个字符串 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匹配结果:" << r1.str() << endl; cout << "s2匹配结果:" << r2.str() << endl; cout << endl; //regex_match只返回第一个匹配结果 smatch rr1; smatch rr2; cout << boolalpha << regex_search(s1, rr1, reg1) << endl; cout << "s1匹配结果:" << rr1.str() << endl; cout << boolalpha << regex_search(s2, rr2, reg1) << endl; cout << "s1匹配结果:" << rr2.str() << endl; cout << endl; //使用iterator返回多个匹配结果 //结果要用-> cout << "iterator结果:" << endl; sregex_iterator it(s2.begin(), s2.end(), reg1); sregex_iterator end; for(; it != end; ++it) { cout << it->str() << endl; //cout << *it << endl; 错误 } cout << "token_iterator结果:" << 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; } //子表达式匹配 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 << "输出: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 << "输出:[i]" << endl; cout << m[0] << endl; cout << m[1] << endl; cout << m[2] << endl; cout << m[3] << endl; cout << m[4] << endl; //输出结果同上 //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; }
参考: 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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