GCC 4.9 introduces a newer C++ ABI version than your system libstdc++ has, so you need to tell the loader to use this newer version of the library by adding that path to LD_LIBRARY_PATH. Unfortunately, I cannot tell you straight off where the libstdc++ so for your GCC 4.9 installation is located, as this depends … Read more
Yes, this is an extension. It’s likely to be added to C++17 as part of the ‘concepts’ proposal, I believe.
regex_match only returns true when the entire input sequence has been matched, while regex_search will succeed even if only a sub-sequence matches the regex. Quoting from N3337, ยง28.11.2/2 regex_match [re.alg.match] Effects: Determines whether there is a match between the regular expression e, and all of the character sequence [first,last). … Returns true if such a … Read more