封装常用正则表达式的用法

regexhelper.h

复制代码 代码如下:
#ifndef REGEX_HELPER_H_INCLUDE
#define REGEX_HELPER_H_INCLUDE
#include
#include
namespace framework{
class RegexHelper
{
public:
    RegexHelper();
    virtual ~RegexHelper();
   
    static bool IsMatch(const char* input,const char* pattern);
   
    static std::string Match(const char* input,const char* pattern,int group = 0);
   
    static int Match(const char* input,const char* pattern,std::vector& results);
   
    static int Matches(const char* input,const char* pattern);
   
    static int Matches(const char* input,const char* pattern,std::vector& results,int group = 0);
   
    static std::string ReplaceFirst(const char* input,const char* pattern,const char* repValue);
   
    static std::string ReplaceAll(const char* input,const char* pattern,const char* repValue);
   
    static int Split(const char* input,const char* pattern,std::vector& results);
   
    static int Split(const char* input,const char* pattern,std::vector& subs,std::vector& results);

protected:
private:
};
}
#endif // REGEX_HELPER_H_INCLUDE

regexhelper.cpp

复制代码 代码如下:
#include "regexhelper.h"
#include

namespace framework{

RegexHelper::RegexHelper()
{
    //ctor
}

RegexHelper::~RegexHelper()
{
    //dtor
}
bool RegexHelper::IsMatch(const char* input,const char* pattern)
{
    boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
    bool ret = boost::regex_search( input , reg);
    return ret;
}
std::string RegexHelper::Match(const char* input,const char* pattern,int group)
{
    if(group < 0)group = 0;
    boost::cmatch mat;
    boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
    bool success = boost::regex_search( input, mat, reg);
    if(success){
        if(mat[group].matched){
            return std::string(mat[group]);
        }
    }
    return std::string("");
}
int RegexHelper::Match(const char* input,const char* pattern,std::vector& results)
{
    boost::cmatch mat;
    boost::regex reg( pattern , boost::regex::perl|boost::regex::icase );
    bool success =boost::regex_search( input, mat, reg);
    int total = 0;
    if(success){ //如果匹配成功
        //cout << "match success" << endl;
        //显示所有子串
        for(boost::cmatch::iterator itr=mat.begin(); itr!=mat.end(); ++itr){
            //       指向子串对应首位置        指向子串对应尾位置          子串内容
            //cout << itr->first-szStr << ' ' << itr->second-szStr << ' ' << *itr << endl;
            results.push_back(std::string(*itr));
            total++ ;
        }
    }
    return total;
}
int RegexHelper::Matches(const char* input,const char* pattern)
{
    boost::regex reg( pattern, boost::regex::perl|boost::regex::icase);    //查找字符串里的数字
    boost::cregex_iterator itrBegin = make_regex_iterator(input,reg); //(szStr, szStr+strlen(szStr), reg);
    boost::cregex_iterator itrEnd;
    int total = 0;
    for(boost::cregex_iterator itr=itrBegin; itr!=itrEnd; ++itr){
        //cout << (*itr)[0].first-szStr << ' ' << (*itr)[0].second-szStr << ' ' << *itr << endl;
        total++;
    }
    return total;

}
int RegexHelper::Matches(const char* input,const char* pattern,std::vector& results,int group)
{
    if(group < 0)group = 0;
    boost::regex reg( pattern, boost::regex::perl|boost::regex::icase);    //查找字符串里的数字
    boost::cregex_iterator itrBegin = make_regex_iterator(input,reg); //(szStr, szStr+strlen(szStr), reg);
    boost::cregex_iterator itrEnd;
    int total = 0;
    for(boost::cregex_iterator itr=itrBegin; itr!=itrEnd; ++itr){
        //cout << (*itr)[0].first-szStr << ' ' << (*itr)[0].second-szStr << ' ' << *itr << endl;
        results.push_back(std::string((*itr)[group]));
        total++;
    }
    return total;
}
std::string RegexHelper::ReplaceFirst(const char* input,const char* pattern,const char* repValue)
{
    //( 1 )   ((  3  )  2 )((  5 )4)(    6    )
    //(/w+)://((/w+/.)*/w+)((//w*)*)(//w+/./w+)?
    //^协议://网址(x.x...x)/路径(n个/字串)/网页文件(xxx.xxx)
    //const char *szReg = "(\w+)://((\w+\.)*\w+)((/\w*)*)(/\w+\.\w+)?";
    //const char *szStr = "http://www.cppprog.com/2009/0112/48.html";
    //repValue = ""
    boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
    std::string sret = boost::regex_replace( std::string(input), reg, std::string(repValue));
    return sret;
}
std::string RegexHelper::ReplaceAll(const char* input,const char* pattern,const char* repValue)
{
    //string s1 = "(<)|(>)|(&)";
    //string s2 = "(?1<)(?2>)(?3&)";
    boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
    std::string sret = boost::regex_replace( std::string(input), reg, std::string(repValue), boost::match_default | boost::format_all);
    return sret;
}
int RegexHelper::Split(const char* input,const char* pattern,std::vector& results)
{
    boost::regex reg(pattern, boost::regex::perl|boost::regex::icase);  //按/符拆分字符串
    boost::cregex_token_iterator itrBegin = make_regex_token_iterator(input,reg,-1); //使用-1参数时拆分，使用其它数字时表示取第几个子串，可使用数组取多个串
    boost::cregex_token_iterator itrEnd;
    int total = 0;
    for(boost::cregex_token_iterator itr=itrBegin; itr!=itrEnd; ++itr){
        //cout << *itr << endl;
        results.push_back(std::string(*itr));
        total++;
    }
    return total;
}
int RegexHelper::Split(const char* input,const char* pattern,std::vector& subs,std::vector& results)
{
    boost::regex reg(pattern, boost::regex::perl|boost::regex::icase);  //取/的前一字符和后一字符（这个字符串形象貌似有点邪恶-_-）
    boost::cregex_token_iterator itrBegin = make_regex_token_iterator(input,reg,subs); //使用-1参数时拆分，使用其它数字时表示取第几个子串，可使用数组取多个串
    boost::cregex_token_iterator itrEnd;
    int total = 0;
    for(boost::cregex_token_iterator itr=itrBegin; itr!=itrEnd; ++itr){
        //cout << *itr << endl;
        results.push_back(std::string(*itr));
        total++;
    }
    return total;
}
}

测试代码

复制代码 代码如下:
void testregex()
{
     //( 1 )   ((  3  )  2 )((  5 )4)(    6    )
        //(/w+)://((/w+/.)*/w+)((//w*)*)(//w+/./w+)?
        //^协议://网址(x.x...x)/路径(n个/字串)/网页文件(xxx.xxx)
        const char *szReg = "(\w+)://((\w+\.)*\w+)((/\w*)*)(/\w+\.\w+)?";
        const char *szStr = "sss http://www.cppprog.com/2009/0112/48.html";

        {    //字符串匹配
            cout <<"match:"<< framework::RegexHelper::IsMatch(szStr,szReg)<            //assert(r);
        }

        {    //提取子串
            vector results;
            int total = framework::RegexHelper::Match(szStr,szReg,results);
            cout << "total="<            if(total > 0){
                for(vector::const_iterator it = results.begin(); it != results.end(); ++it){
                    cout<< *it <                }
            }

        }

        { //查找
            cout<

        }

        { //替换
            cout<        }
        { //替换2，把<>&转换成网页字符
            string s1 = "(<)|(>)|(&)";
            string s2 = "(?1<)(?2>)(?3&)";
            cout<            cout<

        }

        { //使用迭代器找出所有数字
            vector results;
            int total = framework::RegexHelper::Matches(szStr,"\d+",results);
            cout << "total="<            if(total > 0){
                for(vector::const_iterator it = results.begin(); it != results.end(); ++it){
                    cout<< *it <                }
            }
        }

        { //使用迭代器拆分字符串
            vector results;
            int total = framework::RegexHelper::Split(szStr,"/",results);
            cout << "total="<            if(total > 0){
                for(vector::const_iterator it = results.begin(); it != results.end(); ++it){
                    cout<< *it <                }
            }

        }

        { //使用迭代器拆分字符串2
            vector results;
            // 第一子串和第二子串
            vector subv;subv.push_back(1),subv.push_back(2);
            //取/的前一字符和后一字符（这个字符串形象貌似有点邪恶-_-）
            int total = framework::RegexHelper::Split(szStr,"(.)/(.)",subv,results);
            cout << "total="<            if(total > 0){
                for(vector::const_iterator it = results.begin(); it != results.end(); ++it){
                    cout<< *it <                }
            }
        }
}