[Boost-users] boost.xpressive is inefficient while seaching in raw bytes

From: Aries Tao (tao_at_[hidden])
Date: 2008-01-20 10:03:01

hi everybody,I use boost.xpressive to search email address in a binary file which size is 10*1024*1024 bytes. every bytes is 0x6f in that file.boost.xpressive is inefficient. anyone can help me? thanks!
the code is below:
 
    //read file
    CFile file(_T("d:\\test.dat"),CFile::modeRead );    byte* pBuffer = new byte[file.GetLength()];    file.Read(pBuffer,file.GetLength());
 
 
    std::string str((char*)pBuffer,file.GetLength());  
 
    sregex token = sregex::compile("([a-z#~_\\.!\\#$%\\^&\\*\\(\\)\\-]+@[a-z#_\\-]+\\.[a-z#_\\-\\.]+)");
    sregex_iterator cur( str.begin(), str.end(), token );    sregex_iterator end;
    for( ; cur != end; ++cur )    {       smatch const &what = *cur;       std::string strResult = what[0];
       int start = what[0].first - str.begin();    }
 
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