Re: [Boost-users] How do I use regex to match two consecutivenewlines?

From: Tommy Li (tommycli_at_[hidden])
Date: 2006-08-03 21:26:55

John Maddock wrote:
> Tommy Li wrote:
>>> I think I'm missing something obvious. Anyone have any idea?
>> By the way, I can't even match one newline char with "\\n" though they
>> are obviously there.
> 
> Well here's a sample program that obviously shows it does work :-)
> 
> #include <boost/regex.hpp>
> #include <iostream>
> 
> int main(int,char**) 
> {
>   boost::regex e("\\n");
>   std::string s("one\ntwo\nthree");
>   boost::sregex_token_iterator i(s.begin(), s.end(), e, -1), j;
>   while(i != j)
>   {
>     std::cout << "<" << *i << ">" << std::endl;
>     ++i;
>   }
> }
> 
> which outputs:
> 
> <one>
> <two>
> <three>
> 
> Just as expected.
> 
> John.

Great. Thanks a ton. The problem I was having was that I was using 
getline to read from stdin, which stripped the newlines (duh). Changing 
it to while(!cin.eof()) input.append(1, cin.get()); fixed it.

By the way, do you have a better way of reading the entire stream, 
including newlines, into a string?