[Boost-bugs] [Boost C++ Libraries] #4123: smatches contains wrong matches, access changes content

Subject: [Boost-bugs] [Boost C++ Libraries] #4123: smatches contains wrong matches, access changes content
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-04-19 21:51:32

#4123: smatches contains wrong matches, access changes content
-------------------------------------+--------------------------------------
 Reporter:  g_sauthoff@…             |       Owner:  johnmaddock
     Type:  Bugs                     |      Status:  new        
Milestone:  Boost 1.43.0             |   Component:  regex      
  Version:  Boost Development Trunk  |    Severity:  Problem    
 Keywords:                           |  
-------------------------------------+--------------------------------------
 {{{
 $ cat main.cc
 #include <boost/regex.hpp>
 #include <iostream>


 int main(int argc, char **argv)
 {
   boost::regex expr(argv[1]);
   boost::smatch matches;
   if (boost::regex_search(std::string(argv[2]), matches, expr)) {
     for (size_t i = 0; i<matches.size(); ++i)
       std::cout << "XXX " << matches[i] << '\n';
     for (size_t i = 0; i<matches.size(); ++i)
       std::cout << "YYY " << matches[i] << '\n';
     for (size_t i = 0; i<matches.size(); ++i)
       std::cout << "ZZZ " << matches[i] << '\n';
   }
 }
 $ ./main 'to ([a-z]+) [A-Z]+ ([0-9]+)' 'fs to hello WORLD 123'
 XXX to hello WORLD 123
 XXX lo WO
 XXX 23
 YYY hello WORLD 12323
 YYY WORLD
 YYY 23
 ZZZ lo WORLD 1232323
 ZZZ LD 12
 ZZZ 23
 }}}

 Expected output:
 three times: hello 123
 (or at least three times the same output)

 Perhaps I am using the API wrong, but I am inspired by this
 example(-output):
 /usr/share/doc/libboost1.38-doc/HTML/libs/regex/doc/html/boost_regex/captures.html

 I get the same results with boost 1.38.

 Using Ubuntu 9.10, x86/64, g++ 4.4.1.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4123>
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