Re: Problem with regular expression (newbie). Solution

From: aitors2002 (aitors2002_at_[hidden])
Date: 2003-04-03 09:20:33

--- In Boost-Users_at_[hidden], "aitors2002" <aitors2002_at_y...> wrote:
> 
> Hello, the next program doesn't work. It should print all the lines except the ones starting with '#'.
> It does work in perl : 
> $ perl -ne 'print unless /^\s*\#/' a.cc
> 
> why ?
> 
> Thank you
>                               aitor
> 
> -------------------
> // a.cc
> #include<iostream>
> #include<fstream>
> #include<string>
> #include<vector>
> #include<boost/regex.hpp>
> 
> int main() {
> 
>   using namespace std;
> 
>   ifstream f("a.cc");
>   string l;
>   vector<string> v;
>   static const boost::regex r("^\\s*\\#", boost::regbase::escape_in_lists | 
>                                                             boost::regbase::perl);
> 
>   while(f) {
>     getline(f,l,'\n');
>     if (boost::regex_match(l,r)) continue;
>     v.push_back(l);
>   }
>   for(vector<string>::const_iterator it = v.begin();
>       it != v.end(); ++it)
>     cout << *it << endl;
> }

Hello again,

the problem was because of using regex_match instead of regex_search, 
since regex_match requires that the whole string matches.

Thank you for the help

                         aitor