I recently found out that regex support in gcc 4.8 is incomplete, and it was truly implemented in gcc 4.9 (see Is gcc 4.8 or earlier buggy about regular expressions?).
So, wanting to work with regex in my c++ program, I updated my gcc to 4.9 following this instructions (https://askubuntu.com/questions/466651/how-do-i-use-the-latest-gcc-4-9-on-ubuntu-14-04).
Now when I try to compile my program it says that in order to #include <regex> I have to specify the compiler flag -std=c++11, which I did, and now I'm faced with new compilation problems that I didn' had before (‘constexpr’ needed for in-class initialization of static data member).
Given that, I think for now it is best to stick to gcc 4.8 and not specify the gnu++11 flag in compilation. Back to square 1.
So, can I work with regular expressions in c++ if I do not want to switch to gcc 4.9 nor flag the compiler with c++11? Is there another way?
Thanks!
PS: actually it's the c++11 flag that causes the compilation issues, not the version of gcc, right?
You can install the PCRE library and use that instead of the C++11 standard regular expressions. PCRE is really designed as a C library/interface, rather than C++, but writing a couple of trivial wrapper classes or just using it as a C library is quite easy.