boost's regex won't compile

Question

I am using boost 1.45.0 on Ubuntu with Code::Blocks as my IDE, and I can't get basic_regex.hpp to compile. I'm pretty sure I set up boost correctly, because I can compile programs using boost::format without any errors. But I'm getting this annoying error, and I don't know how to get rid of it.

The code that is provoking the error:

boost::regex e("\"http:\\\\/\\\\/localhostr.com\\\\/files\\\\/.+?\"");

Compiler output (GCC):

obj/Debug/main.o
In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)'

/home/neal/Documents/boost_1_45_0/boost/regex/v4/basic_regex.hpp|379|
undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)'|

||=== Build finished: 1 errors, 0 warnings ===|

Did I miss a step when setting up boost, or should I downgrade to another version of boost?

Answer 1

This looks like a linker error. boost::regex is not a header only library so you need to pass -lboost_regex with correct -L/path/to/boost/lib to linker.