C++ – How to use Boost::regex.hpp library in C++

boostboost-regexc++regex

I tried to use Boost library but I failed, see my code:

#include "listy.h"
#include <boost/regex.hpp>
using namespace boost;

ListyCheck::ListyCheck() {

}

ListyCheck::~ListyCheck() {

}

bool ListyCheck::isValidItem(std::string &__item) {
    regex e("(\\d{4}[- ]){3}\\d{4}");

    return regex_match(__item, e);
}

When I tried to compile it I get those messages:

/usr/include/boost/regex/v4/regex_match.hpp:50:
undefined reference to
`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator,
std::allocator > >,
std::allocator,
std::allocator > > > >,
boost::regex_traits >

::match()'

/usr/include/boost/regex/v4/basic_regex.hpp:425:
undefined reference to
`boost::basic_regex >

::do_assign(char const*, char const*, unsigned int)'

/usr/include/boost/regex/v4/perl_matcher.hpp:366:
undefined reference to
`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator,
std::allocator > >,
std::allocator,
std::allocator > > > >,
boost::regex_traits >

::construct_init(boost::basic_regex > >
const&,
boost::regex_constants::_match_flags)'

etc…

Best Solution

You need to link to libboost_regex. Add -lboost_regex to the compiler switch if you're using gcc.

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