最后用C++实现了一把，因为STL中尚未包含Regular Expression，因此我使用了Boost中的Regex++。不过因为不是很熟悉，所以代码很蹩脚，将就看了。呵呵。
#include <string>
#include <boost/regex.hpp>
#include <iostream>
#include <fstream>
using namespace std;
void readFile( const char* filename, string& str );
void writeFile( const char* filename, const string str );
void filter( const string input, string& output );
int main(int argc, const char* argv[])
{
if( argc < 3 )
{
cout<< "Please enter 2 filenames(e.g. In.txt Out.txt)" << endl;
return 1;
}
string strIn, strOut;
readFile( argv[1], strIn );
filter( strIn, strOut );
writeFile( argv[2], strOut );
}
void readFile( const char* filename, string& str )
{
ifstream in( filename );
str.erase();
str.reserve( in.rdbuf()->in_avail() );
string strTemp;
while( !in.eof() )
{
in >> strTemp;
str.append(strTemp);
}
in.close();
}
void writeFile( const char* filename, const string str )
{
ofstream out( filename );
out.write( str.c_str(), (streamsize)str.length() );
out.flush();
out.close();
}
void filter( const string input, string& output )
{
output.erase();
output.reserve( input.length() );
boost::regex expression("\"(\\w+):(\\w+)%(\\w+)\"");
boost::smatch group;
boost::regex_constants::match_flag_type flags = boost::regex_constants::match_default;
string::const_iterator start, end;
start = input.begin();
end = input.end();
while( boost::regex_search( start, end, group, expression, flags ))
{
output.append( group[1] );
output.append( ":" );
output.append( group[2] );
output.append( "*" );
output.append( group[3] );
output.append( "," );
output.append( "\n" );
// update
start = group[0].second;
flags |= boost::regex_constants::match_prev_avail;
flags |= boost::regex_constants::match_not_bob;
}
return;
}
