对C++ TR1 regular expressions的简单使用

2011-02-19 wcdj

 

[1] regex_search
[2] regex_match
[3] Retrieve a Match tr1::cmatch
[4] regex_replace
[5] Case-insensitive std::tr1::regex_constants::icase

 

#include <iostream>#include <string>#include <regex>#include <cassert>using namespace std;int main(){string str = "Hello world";tr1::regex rx("ello");// [1] regex_search//assert( regex_search(str.begin(), str.end(), rx) );if (regex_search(str.begin(), str.end(), rx)){cout<<"find it!"<<endl;// ok} else{cout<<"not find!"<<endl;}// [2] How Do I Do a Match? regex_matchstr = "Hello world";rx = "ello";if (regex_match(str.begin(), str.end(), rx)){cout<<"find it!"<<endl;} else{cout<<"not find!"<<endl;// ok}// [3] How Do I Retrieve a Match? tr1::cmatch res;str = "<h2>Egg prices</h2>";rx = "<h(.)>([^<]+)";tr1::regex_search(str.c_str(), res, rx);cout << res[1] << ". " << res[2] << "/n";// 2. Egg prices// [4] How Do I Do a Replace? regex_replacestr = "Hello world";rx = "world";string replacement = "planet";string str2 = std::tr1::regex_replace(str, rx, replacement);cout<<str2<<endl;// Hello planet// [5] How Do I Make a Regular Expression Case-insensitive?str = "My name is wcdj";tr1::regex rx2("WcdJ",std::tr1::regex_constants::icase);//assert( regex_search(str.begin(), str.end(), rx) );if (regex_search(str.begin(), str.end(), rx2)){cout<<"find it!"<<endl;// ok} else{cout<<"not find!"<<endl;}str = "My name is wcdj";tr1::regex rx3("WcdJ");//assert( regex_search(str.begin(), str.end(), rx) );if (regex_search(str.begin(), str.end(), rx3)){cout<<"find it!"<<endl;} else{cout<<"not find!"<<endl;// ok}return 0;}

 

参考：
[1] Quick Start for C++ TR1 Regular Expressions
http://www.codeproject.com/KB/string/TR1Regex.aspx
[2] Getting started with C++ TR1 regular expressions
http://www.johndcook.com/cpp_regex.html