How to remove punctuations.

[VUEKID]

I need to read a text file, parse file, and check occurence of words without leading or trailing punctuations.

this is what i have so far,

std::ifstream f("textfile.txt"); 
                    std::istream_iterator<std::string> eof; 
                    std::multiset<std::string> words( std::istream_iterator<std::string>(f) , eof); 
                    for( std::multiset<std::string>::iterator i = words.begin(); i!=words.end(); i = words.upper_bound(*i) ) 
                    std::cout << *i<< ": " << words.count(*i) << " times\n";