boost正则表达式

xpressive是boost的正则表达式库，它比boost.regex要好的是它不需要编译，速度快。

匹配(char*)

#include<boost/xpressive/xpressive_dynamic.hpp>
#include<iostream>
using namespace std;

int main()
{
    using namespace boost::xpressive;

    char* str = "there is a POWER-suit item";
    cregex reg = cregex::compile("(power)-(.{4})",icase);//icase：忽略大小写
    assert(regex_search(str,reg));

    cmatch what;
    regex_search(str,what,reg);
    assert(what.size()==3);

    cout << what[0] << "," << what[1] << "," << what[2] << endl;
}

POWER-suit,POWER,suit

匹配(string)

#include<boost/xpressive/xpressive_dynamic.hpp>
#include<iostream>
using namespace std;

int main()
{
    using namespace boost::xpressive;

    string str("Power-bomb,power-suit,pOWER-beam all items\n");

    sregex reg = sregex::compile("power-(\\w{4})",icase);

    sregex_iterator pos(str.begin(),str.end(),reg);
    sregex_iterator end;
    while(pos!=end)
    {
        cout << (*pos)[0] << " ";
        ++pos;
    }
    cout << endl;
}

Power-bomb power-suit pOWER-beam 

替换

#include<boost/xpressive/xpressive_dynamic.hpp>
#include<iostream>
using namespace std;

int main()
{
    using namespace boost::xpressive;

    string str("readme.txt");

    sregex reg1 = sregex::compile("(.*)(me)");
    sregex reg2 = sregex::compile("(t)(.)(t)");

    cout << regex_replace(str,reg1,"manual") << endl;
    cout << regex_replace(str,reg1,"$1you") << endl;//$:匹配行的末尾 readyou
    cout << regex_replace(str,reg1,"$&$&") << endl;
    cout << regex_replace(str,reg2,"$1N$3") << endl;

    str = regex_replace(str,reg2,"$1$3");
    cout << str << endl;
}

manual.txt
readyou.txt
readmereadme.txt
readme.tNt
readme.tt