Regular Expression in OF 0.9

yes it's just because the previous version didn't have support for c++11, in fact the core already uses std::regex instead. another problem is that old compilers (for example the one in the raspberry pi) still don't have full support for std::regex so it's probably better to leave the example as it is for 0.9 but if you want to send a PR we can merge it after 0.9 is released