对C++ TR1 regular expressions的简单使用

 [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_match  
    str = "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_replace  
    str = "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

 

 转自：http://blog.csdn.net/delphiwcdj/article/details/6195446