Boost (Regex) Linker problem

[purefan]

Hello all,

Ive been searching for a good while now and have an idea of what is happening back stage yet cant find a way to fix it.

Trying to use regular expressions to find tags in a string:

[Event "Event1"]
[Round "1"]

I include boost/regex.hpp like in every example I found:
#include <boost/regex.hpp>
and as soon as I do:
const boost::regex e("[a-z]+");
( Thats my last copy paste to make sure it wasnt a faulty expression )
my regular expression looks like this:
std::string sRegex("^" +sTag + "[[:space:]]\"(.*)\"$");
where sTag is a function param.

When I try to compile I get the following error:

build/Debug/GNU-Linux-x86/Analyzer.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)':
/usr/include/boost/regex/v4/basic_regex.hpp:273: undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)'
collect2: ld returned 1 exit status

I got Boost from the Ubuntu repositories (Synaptic) and didnt get any error or message to notice. Im using Netbeans 6.8 with g++
if I comment that line out (where the regex is declared) program compiles fine.

Anyone ran into this or know how to fix?

[Bazzy]

How are you compiling? Did you tell the linker that you are using the library?

[moorecm]

Have a quick look at this related thread (and the thread related to it, if necessary):
http://www.cplusplus.com/forum/general/20194/

[moorecm]

In Netbeans, try right clicking on the project and going to Properties (if I remember correctly). Somewhere in there you'll be able to specify include paths, library paths, libraries, etc.. I think you'll have to link with the boost_regex library.

[purefan]

Thank you for your suggestions, finally figured it out (I think)

here's what I've done (maybe someone will find it helpful in the future)
- On Project properties went to the Linker section and added /usr/include/boost;/usr/include/boost/regex (find tells me thats where regex.hpp is), tried to compile again and same problem.
- Additional to above (not undoing it), went to Project properties -> C++ Compiler -> Add Library, added /usr/include/boost;/usr/include/boost/regex, still nothing.
- Additional to above (also not undoing) tried adding -lboost_regex to the linker (project properties) and got a different error:

g++ -lboost_regex -o dist/Debug/GNU-Linux-x86/chessparser01 build/Debug/GNU-Linux-x86/Board.o build/Debug/GNU-Linux-x86/Director.o build/Debug/GNU-Linux-x86/Analyzer.o build/Debug/GNU-Linux-x86/main.o -L/usr/include/boost -L/usr/include/boost/regex
/usr/bin/ld: cannot find -lboost_regex

so I issued a find: find /usr/lib -name libboost\*.so
and found one related to regex:

/usr/lib/libboost_regex-mt.so

So went to the Linker properties once again and Add Library, looked for the exact file but it couldnt find it, instead there was a:
/usr/lib/libboost_regex-mt.a
added that and it compiled, Yay! havent tested it running the full code to search for a match but at least it compiles now.

Thank you very much both of you, have a great weeked!